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There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which subatomic particles are involved in the nuclear fusion that powers the Sun?A. protons and neutrons
B. electrons and protons
C. only protons
D. only electrons
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: A class is studying how gravity affects objects in motion. Which tool would best measure the distance an object travels after it is thrown?A. a magnetic compass
B. a meter stick
C. a calculator
D. a stop watch
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Research into the total amount of oil available for use around the world can affect what kind of human choice?A. where to retire
B. how to travel to work
C. what kind of coffee to drink
D. whether to recycle glass and aluminum
| B |
以下是单项选择题，请直接给出正确答案的选项A,B,C,D。
| 题目:拉斯金的著作包括以下的：____
A. 装饰的基本原理
B. 建筑的七盏明灯
C. 论衡
D. 建筑十书
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which of these is the primary source of energy in food webs?A. soil
B. sunlight
C. producer
D. consumer
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which process below is an example of an endothermic process?A. ice melting
B. water freezing
C. food digesting
D. sugar burning
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Astronomers measure distances using very large units called light years. Which distance between celestial objects would most likely be measured in light years?A. distance between the Sun and Earth
B. distance between the Moon and Earth
C. distance between two stars in the same galaxy
D. distance between two p... | C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: A broken bone heals through the process of1. adaptation
2. mutation
3. cell division
4. chemical digestion
| 3 |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Plants do not usually need to eat other organisms because plantsA. do not need food energy to live.
B. turn sunlight into food energy.
C. get all their food energy from soil.
D. keep food energy stored in their roots.
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Soccer players use their muscle systems to kick a ball into a goal. What organ system coordinates the muscles?A. The nervous system
B. The endocrine system
C. The respiratory system
D. The circulatory system
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which process involves choosing certain organisms to reproduce with one another in order to pass on specific, desirable traits to their offspring?1. selective breeding
2. asexual reproduction
3. resource acquisition
4. natural selection
| 1 |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Fertilizers can enable farmers to grow the same crop in a field for several years in a row. Farmers who use less fertilizer often rotate their crops by planting the crop one year and legumes, such as beans and clover, the following year. Fertilizer use and crop rotation with legumes both increase the availabi... | B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which tool is used to measure the diameter of a dime?A. ruler
B. beaker
C. balance
D. compass
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: When would the highest tides occur along the Texas coast?A. at sunrise
B. at sunset
C. during a full moon
D. during a half moon
| C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which two body systems would most directly remove extra fluid from a person's lungs?A. nervous and digestive
B. nervous and circulatory
C. respiratory and digestive
D. respiratory and circulatory
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Conjugation in a paramecium differs from sexual reproduction in volvox because conjugationA. results in two genetically identical cells.
B. requires specialized gonidia cells.
C. forms haploid male and female gametes.
D. takes place between specialized cells.
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: The discovery of tectonic plates and the cause of their movement is best described as a result of which scientific procedure?A. direct observation of the important properties of the Earth system
B. controlled laboratory experimentation on a simulation of geological systems
C. methodical testing of a valid hyp... | D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which of these objects has the greatest mass?A. brick
B. soccer ball
C. note pad
D. quarter
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: The snowshoe hare sheds its fur twice a year. In the summer, the fur of the hare is brown. In the winter, the fur is white. Which of these statements best explains the advantage of shedding fur?A. Shedding fur keeps the hare clean.
B. Shedding fur helps the hare move quickly.
C. Shedding fur keeps the hare's ... | D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: What happens to climate and weather over a summer?A. Weather varies more than climate.
B. Climate varies more than weather.
C. Climate varies, but weather stays the same.
D. Weather and climate vary to the same degree.
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which tools are used to determine the boiling point of water?A. hot plate and stopwatch
B. thermometer and balance
C. hot plate and thermometer
D. balance and graduated cylinder
| C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Vegetables can be scientifically classified by all of these exceptA. size.
B. color.
C. shape of plant parts.
D. whether they taste good.
| D |
以下是单项选择题，请直接给出正确答案的选项A,B,C,D。
| 题目:腿部肌肉中快肌纤维百分组成占优势的人，较适宜从事的运动项目是____
A. 800m跑
B. 1 500m跑
C. 100m跑
D. 1 500m游泳
| C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: When soil becomes saturated during rainfall, excess water begins to collect on the surface. Downslope movement of this excess water to rivers, lakes, and streams is calledA. runoff.
B. filtration.
C. groundwater.
D. condensation.
| A |
以下是单项选择题，请直接给出正确答案的选项A,B,C,D。
| 题目:“吴门四家”不包括____。
A. 沈周
B. 文征明
C. 唐寅
D. 徐渭
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which statement describes how the umbilical cord supports a developing fetus?A. It provides a protective barrier between the mother and the fetus.
B. It keeps the fetus inside the mother until birth.
C. It provides a navel when the baby is born.
D. It supplies oxygen and nutrients to the fetus.
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Algae are organisms that live in water. Scientists discovered a new type of red algae near Knight Island in Prince William Sound. Which statement is most likely a positive effect of this discovery?A. Scientists studying the red algae are disturbing local wildlife.
B. The red algae may help scientists better u... | B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which two body systems are directly involved in movement?A. muscular and skeletal
B. digestive and muscular
C. skeletal and respiratory
D. respiratory and digestive
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Volcanoes are considered constructive because theyA. deposit lava.
B. cause erosion.
C. trigger earthquakes.
D. release gases.
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which characteristic can a puppy inherit from its parents?A. muddy paws
B. spotted fur
C. broken foot
D. scar on face
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: The surface of Earth is composed of large tectonic plates that are constantly shifting as they float on top of molten rock. Which process must occur in the mantle to make the plates move?A. normal faulting
B. seafloor spreading
C. igneous intrusions
D. convection currents
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: The sum of all chemical reactions in the human body is known as1. feedback
2. metabolism
3. dynamic equilibrium
4. biological adaptation
| 2 |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: The best container for storing an unknown liquid is aA. plastic yogurt container.
B. clearly labeled glass jar.
C. paper orange juice container.
D. green plastic soda bottle.
| B |
以下是单项选择题，请直接给出正确答案的选项A,B,C,D。
| 题目:甲、乙两班学生参加植树造林，已知甲班每天比乙班多植5棵树，甲班植80棵树所用的天数与乙班植70棵树所用的天数相等．若设甲班每天植树x棵，则根据题意得出的方程是____
A. $\frac{80}{x-5}=\frac{70}{x}$
B. $\frac{80}{x}=\frac{70}{x+5}$
C. $\frac{80}{x+5}=\frac{70}{x}$
D. $\frac{80}{x}=\frac{70}{x-5}$
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which is a trait that a child can inherit from its parents?A. eye color
B. a broken leg
C. length of hair
D. language skills
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: The Milky Way is a part of 30 or more galaxies called the Local Group. Which would be the most likely reason these galaxies are considered to be part of the Local Group?A. They are all the same type of galaxy.
B. They all have the same number of stars.
C. They are all attracted to each other by gravity.
D. Th... | C |
以下是单项选择题，请直接给出正确答案的选项A,B,C,D。
| 题目:下列化学用语既能表示一种元素，又能表示一个原子，还能表示一种物质的是____
A. O
B. Cu
C. N
D. $CO_2$
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: A car is rolling on a level street. What can make the car stop moving?A. a force that pushes straight up
B. a force that pushes straight down
C. a force that pushes the same direction that the car is moving
D. a force that pushes the opposite of the direction that the car is moving
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which technique has helped scientists more accurately determine the age of fossils and draw conclusions about changes in organisms over time?A. time-lapse photography
B. radioactive dating
C. electron microscopy
D. color staining
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Ocean currents, like the Gulf Stream, affect world climate byA. spreading plant and animal life over a wider area.
B. ensuring ocean density is not the same globally.
C. carrying sediment from rivers and inland basins.
D. transferring heat to and from various regions.
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which items would be most useful at home during a power failure?A. flashlights and extra batteries
B. hats and sunscreen
C. raincoats and umbrellas
D. insect spray and jackets
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: When light reflects off certain crystals in the atmosphere, effects called halos appear. Which substance in the atmosphere forms these crystals?A. carbon dioxide
B. oxygen
C. sulfur dioxide
D. water
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: What keeps the Moon orbiting Earth?A. the Sun's gravity
B. the Moon's rotation
C. Earth's rotation
D. Earth's gravity
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: If two organisms are classified in different orders but are in the same class, which of these statements is true?A. The organisms have the same genus.
B. The organisms are in the same phylum.
C. The organisms are in different kingdoms.
D. The organisms are members of the same species.
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Down feathers are used by many sleeping bag manufacturers because down feathers areA. fire resistant.
B. comfortable padding.
C. good insulators.
D. water resistant.
| C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Why are some rocks smoother and rounder than others?A. They have the shapes of the minerals from which they are made.
B. They were smoothed by the action of wind and water.
C. They were squeezed up through the soil.
D. They hardened in rounded pockets of soil.
| B |
以下是单项选择题，请直接给出正确答案的选项A,B,C,D。
| 题目:幼儿园教师甲在幼儿园卫生间多次用针刺戳肖某等10余名幼儿的臀部，虽未造成伤害后果，但情节十分恶劣。甲的行为应认定为____。
A. 侮辱罪
B. 猥亵儿童罪
C. 虐待被监护、看护人罪
D. 故意伤害罪
| C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which statement explains why light from the Sun can warm up water in a glass?A. Light travels very fast.
B. Light travels in straight lines.
C. Water reflects light energy.
D. Water absorbs light energy.
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: The boiling point of water in degrees Celsius isA. 0°C.
B. 32°C.
C. 100°C.
D. 212°C.
| C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: The crude oil extracted today was formed millions of years ago from the fossilized remains of algae and other tiny marine organisms. Most parts of the organisms decomposed soon after they died. Which biomolecules decomposed more slowly and became the basis of crude oil?A. proteins
B. carbohydrates
C. fatty ac... | C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: A metal pan will heat up quickly when placed over a gas or electric burner. The metal pan is a goodA. resistor.
B. insulator.
C. conductor.
D. accelerator.
| C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: When tectonic plates move, they can form different landforms. Which is least likely to be associated with the tectonic plate movement that forms volcanoes?A. hot spot
B. rift valley
C. subduction zone
D. transform boundary
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: An airplane flies in a straight line between two cities that are separated by 840 kilometers. If it takes 4 hours for the airplane to make the trip, what is its average speed?A. 84 km/h
B. 105 km/h
C. 180 km/h
D. 210 km/h
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Pat dissolves some table salt in water. She then puts a drop of the water on a microscope slide and turns on the lamp. As the water evaporates, Pat observes small cubic structures being formed. What process is Pat seeing through the microscope?A. purification of an ore
B. the growth of a crystal
C. a liquid b... | B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: There are two types of modern whales: toothed whales and baleen whales. Baleen whales filter plankton from the water using baleen, plates made of fibrous proteins that grow from the roof of their mouths. The embryos of baleen whales have teeth in their upper jaws. As the embryos develop, the teeth are replace... | A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: The sound heard when a piano key is hit is caused byA. vibration.
B. refraction.
C. momentum.
D. acceleration.
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: In order to locate a beetle population, scientists must use a highly specialized piece of equipment. Which factor would most likely limit the ability to locate beetles?A. climate
B. expense
C. sample size
D. politics
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: An octopus squirts black ink around itself to hide from predators. This adaptation is an example ofA. creating shelter
B. recycling nutrients
C. a transfer of energy
D. a defense mechanism
| D |
以下是单项选择题，请直接给出正确答案的选项A,B,C,D。
| 题目:已知21四体的胚胎不能成活。现有一对夫妇均为21三体综合征患者，假设他们在产生配子时，第21号的三体染色体一条移向细胞的一极，两条移向另一极,则他们生出患病女孩的概率是____
A. 1/2
B. 1/3
C. 2/3
D. 1/4
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which element makes up most of the air we breathe.A. carbon
B. nitrogen
C. oxygen
D. argon
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: An anemometer is a tool that measuresA. wind direction.
B. wind speed.
C. air pressure.
D. air temperature.
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which of the following is the most likely cause of earthquakes?A. shifting rock layers
B. crashing meteorites
C. rotation of the core
D. magnetic force
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: A student observes that a one-celled organism and a plant leaf have similar green parts. The student thinks that both organisms use the green parts to live. Which evidence supports the conclusion that both organisms need the green parts to live?A. Both organisms use the green parts to move.
B. Both organisms ... | B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: A student plans to conduct an experiment to see how quickly mice learn to navigate a maze to reach a reward at the other end. Which of these will help lead to the most accurate conclusion?A. make the maze bigger
B. provide different food rewards
C. use a reward other than food
D. use the same maze and reward ... | D |
以下是单项选择题，请直接给出正确答案的选项A,B,C,D。
| 题目:下面几点措施中，____不属于Unix的动态优先权法。
A. 进程在核心态下运行，不进行强迫调度
B. 赋予因等待不同资源或事件的睡眠进程不同的优先数
C. 超级用户进程可以要求系统赋予较高的优先权
D. 由时间片轮转法规定各个就绪进程顺次轮流使用处理机
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Dan knows the Earth is tilted 23.5° on its axis. Which is caused because of this tilt?A. day can become night
B. different seasons occur
C. low tide can become high tide
D. the change in phases of the Moon
| B |
以下是单项选择题，请直接给出正确答案的选项A,B,C,D。
| 题目:在规划实施过程中由城乡规划主管部门核发的证书不包括____。
A. 建设用地规划许可证
B. 建设工程规划许可证
C. 乡村建设规划许可证
D. 建设工程施工许可证
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which term best describes the movement of water through cell membranes?A. respiration
B. osmosis
C. mitosis
D. condensation
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: If an atom of hydrogen gives up one electron, what is its overall charge?A. -1
B. +1
C. -2
D. +2
| B |
以下是单项选择题，请直接给出正确答案的选项A,B,C,D。
| 题目:对于沿曲线运动的物体，以下几种说法中哪一种是正确的____
A. 切向加速度必不为零
B. 法向加速度必不为零（拐点处除外）
C. 由于速度沿切线方向，法向分速度必为零，因此法向加速度必为零
D. 若物体作匀速率运动，其总加速度必为零
| B |
以下是单项选择题，请直接给出正确答案的选项A,B,C,D。
| 题目:下列各句中，没有语病的一句是____
A. 半期考试之后，因为她这样好的成绩，获得了老师和同学们的颂扬。
B. 全校师生在雷锋精神的鼓舞下，好人好事，如雨后春笋似的涌现出来。
C. 他们襟怀胸襟祖国，放眼天下，在高手如林的雅典奥运会上，大力发扬了敢拼敢搏，终于夺得了冠军。
D. 这个节目表达了同学们要以实际行动向雷锋同志学习，以优异的成绩向党报告的决心。
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Secondary pollutants are produced in the environment by chemical reactions involving primary or emitted chemicals. Which of the following is a secondary pollutant?A. carbon monoxide (CO)
B. nitrogen oxide (NO)
C. methane (CH_{4})
D. ozone (O_{3})
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Indigo buntings are birds that nest in Florida during the summer. Male buntings are bright blue in color while females are a dull brown. How does the dull brown color of the female buntings help the species survive?A. It helps male birds find a mate.
B. It helps the birds find food more easily.
C. It helps hi... | C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Elephants on the African savanna eat shrubs and small trees. This behavior clears land and enables grass to grow. Grazers such as gazelles eat the grass. Lions prey on the gazelles. Which two organisms in this scenario are in the most cooperative relationship?A. the elephants and the shrubs
B. the shrubs and ... | C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: A solar eclipse occurs whenA. the Moon blocks the Earth from the Sun.
B. the first four planets in the solar system are aligned.
C. Earth blocks the Moon from the Sun.
D. Earth's shadow falls on the Sun.
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Earth, along with the other planets, revolves around the Sun. The planets revolve in a counterclockwise direction. The cause of the revolution is mostly due to which force?A. electrical
B. frictional
C. gravitational
D. magnetic
| C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: What is the best way for a scientist to begin an investigation on a population of deer?A. typing results into a computer
B. intuition
C. writing facts in a field notebook
D. observing the deer in their own habitat
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which of these can be mined from Earth and used as an energy source?A. Coal
B. Gravel
C. Granite
D. Limestone
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Termites eat wood but cannot digest it. Protozoans live in the termites' stomachs and use enzymes to break down the wood. The digested wood provides nutrition for both the termites and the protozoans. What type of relationship is this?A. mutualism
B. parasitism
C. predation
D. commensalism
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: The largest body in our solar system isA. Earth.
B. the Sun.
C. Jupiter.
D. the Moon.
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which of the following allows the planets to stay in orbit?A. the Moon's gravity
B. the Sun's gravity
C. magnetism
D. rotation
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Garrett collected some large rocks from a stream near his home. He measured the rocks on a balance. When he records the mass of the rocks, which units should Garrett use?A. pounds
B. kilograms
C. fluid ounces
D. cubic centimeters
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which immune system function is carried out by antibodies?A. Antibodies produce proteins that attach to an invading virus.
B. Antibodies attach to an invading virus as a target marker.
C. Antibodies engulf the invading virus as a defense mechanism.
D. Antibodies release enzymes that lyse the invading virus.
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Herbivores that evolved on grassy plains are likely to naturally select for traits different than herbivores that evolved in rain forests. Which trait is a plains herbivore most likely to develop over thousands of years?A. long legs for running
B. sharp claws for climbing
C. webbed feet for swimming
D. prehen... | A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which group on the periodic table contains elements that are the least reactive?A. group 1 (1A)
B. group 3 (3B)
C. group 16 (6A)
D. group 18 (8A)
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Light waves that cross from an air medium to a water medium willA. be focused into a straight line.
B. lose energy and dissipate.
C. change length and direction.
D. reflect off the water's surface.
| C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: An experiment is performed with a sealed container. The container starts out with a temperature of 70 degrees F and an air pressure of 20 psi. The container is heated, and the pressure inside the container rises evenly with increased temperature. If the container is cooled back to 70 degrees F, what will the ... | B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: In whitetail deer, females seldom grow antlers. Which best explains why male whitetail deer grow antlers but females seldom grow antlers?A. Female deer have no need for antlers.
B. Male deer are older than female deer.
C. Antler growth is controlled by genes.
D. Antler growth depends on behavior.
| C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: When one form of energy is converted into other forms of energy, the total amount of energyA. varies throughout the conversion.
B. increases because some energy is created.
C. remains constant throughout the conversion.
D. decreases because some energy is destroyed.
| C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Ana is a cross-country runner. After finishing a race she noticed that she felt hot due to the release of thermal energy. Which is the most likely source of the thermal energy?A. friction from the air
B. heat being absorbed from the sun
C. mechanical energy being absorbed
D. energy conversions occurring in he... | D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Hydrogen is located on the left side of the periodic table in the same column as the alkali metals, but it has characteristics of a nonmetal. Which of the following is a physical property of hydrogen?A. Hydrogen can bond to itself.
B. Hydrogen makes positive ions.
C. Hydrogen is a gas at room temperature.
D. ... | C |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which cells help to destroy pathogens such as bacteria that enter the human body?A. red blood cells
B. liver cells
C. white blood cells
D. brain cells
| C |
以下是单项选择题，请直接给出正确答案的选项A,B,C,D。
| 题目:《本草纲目》的作者是____李时珍。
A. 南宋人
B. 明朝人
C. 元朝人
D. 清朝人
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Denise was driving east over a hill in the afternoon, shortly after a rain shower. Suddenly the sun broke through the clouds, and she saw a rainbow ahead of her. Which of the following made the rainbow possible?A. Sunlight can be separated into all the colors of the rainbow.
B. Water reflects sunlight like a ... | A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which sentence describes a characteristic of offspring produced by sexual reproduction?A. The offspring have half the amount of genetic material as the parents.
B. The offspring contain genetic material from both parents.
C. The female offspring contain only genes from the mother.
D. The male offspring contai... | B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Electricity to play your radio can be made using renewable or nonrenewable resources. Which of the following resources are renewable?A. wind and oil
B. wind and sunlight
C. natural gas and oil
D. natural gas and coal
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which of the following is a chemical property of a substance?A. mass of 372 g
B. reacts with HCl
C. density of 37 g/cm^3
D. white powder with silver specks
| B |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which is the best tool for measuring the temperature of lake water?A. Meter stick
B. Balance
C. Graduated cylinder
D. Thermometer
| D |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Which two protein molecules are essential for muscle contraction and relaxation?A. actin and myosin
B. collagen and tubulin
C. hemoglobin and myoglobin
D. amylase and polymerase
| A |
There is a single choice question. Answer the question by replying A, B, C or D.
| Question: Mercury, the planet nearest to the Sun, has extreme surface temperatures, ranging from 465°C in sunlight to -180°C in darkness. Why is there such a large range of temperatures on Mercury?A. The planet is too small to hold heat.
B. The planet is heated on only one side.
C. The planet reflects heat from its dar... | D |
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