．The fact has worried many scientists ______ ...

．The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.

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The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.

高一英语单项填空简单题查看答案及解析

The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.

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The fact has worried many scientists_______ the earth is becoming warmer and warmer these days.

A. what　　　　　　 B. which　　　　　　 C. when　　　　　　　 D. That

高一英语单项填空中等难度题查看答案及解析

The fact has worried many scientists ________the earth is becoming warmer and warmer these years.

A．what           B．which            C．that                     D．whose

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The earth is the only planet that scientists are certain has life .What does the earth have that the other planets don’t ? For one thing , the earth has just the right temperature . As the third planet from the sun , the earth seems to be just the right distance away . The planets that are closer to the sun are so hot that their surfaces bake in the sun . The farthest planets are cold balls .

When the earth developed— which scientists believe may have happened about billions of years ago , many gases covered the earth . The gases caused the earth to be hot . But something wonderful happened . The temperature was just right for thick clouds to form . It rained very hard for a very long time . This gave the earth its oceans . Water made it possible for plants to grow . The plants created oxygen in the atmosphere . Oxygen is the gas that humans and animals breathe .

Only one other planet in the solar system seems to be something like the earth . That planet is Mars . Mars is smaller than the earth , and it is quite a bit cooler . But it is not too cold for humans . On some days , the temperatures are as cold as a winter day in the northern United States . If you wore a special spacesuit , you could walk around on Mars . You would have to bring your own air to breathe , though . The air on Mars is too thin to breathe . Mars has the largest volcano in the solar system . It is sixteen miles high . The highest volcano on the earth is five miles high . The most unexpected sight on Mars is dried-up river beds . Scientists believe that Mars was once much wetter that it is now . Does this mean there could have been living things on Mars ? Scientists are not sure , but there has been no sign so far .

1.It is the ________ on the earth that makes life possible .

A．temperature       B．water             C．oxygen           D．temperature , water and oxygen

2.The underlined phrase “ the third planet ” means ________ .

A．the sun           B．the earth          C．the moon         D．Mars

3.Which planet in the solar system is most like the earth ?

A．Mars .            B．Moon .            C．Sun .             D．Mars and Moon .

4.Which of the following is TRUE ?

A．The earth has a history of about 4 million years .

B．There is no air on Mars .

C．The largest volcano on Mars is over three times higher than the highest one on the earth

D．Scientists believe there are living things on Mars .

5.The best title for the passage should be ________ .

A．Living Things on Our Earth                 B．The Moon

C．Living Things on the Moon                 D．Mars Is Most Like the Earth

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The earth is the only planet that scientists think has life. Why does the earth have life while the other planets (行星) don't? For one thing, the earth is just the right temperature. As the_third_planet from the sun, the earth seems to be just the right distance away. The planets which are closer to the sun are hot that their surfaces bake (烘烤) in the sun. The farthest planets are cold balls.

When the earth developed — which scientists believe may have happened about 4 billion years ago — many gases covered the earth. The gases caused the earth to be hot. But something wonderful happened. The temperature was just right for thick clouds to form. It rained very hard for a very long time. This gave the earth its oceans. Water made it possible for plants to grow. The plants created oxygen in the atmosphere. Oxygen is the gas that humans and animals breathe.

Only one other planet in the solar system seems to be something like the earth. That planet is Mars (火星). Mars is smaller than the earth, and it is quite a bit cooler. But it is not too cold for humans. On some days, the temperatures are as low as a winter day in the northern United States. If you wore a special space suit, you could walk around on Mars. You would have to bring your own air to breathe, the air on Mars is too thin to breathe.

Mars has the largest volcano (火山) in the solar system. It is sixteen miles high. The highest volcano on the earth is five miles high. The most unexpected (未预测到的) sight on Mars is dried up river beds. Scientists believe that Mars was once much better than it is now. Does this mean there could have been living things on Mars? Scientists are not sure, but there has been no sign so far.

1.Which of the following is NOT the reason that the earth has life?

A. The earth is just the right temperature.

B. The volcanos on earth are lower than those on Mars.

C. There is oxygen in the atmosphere of the earth.

D. The earth seems to be just the right distance away from the sun.

2.The underlined phrase “the third planet” in the first paragraph refers to ________.

A. the Sun　　　　　　　　　     B. the Moon

C. the Earth　　　　　　　　     D. the Mars

3.Which of the following about the Mars is NOT true?

A. There could have been living things on Mars.

B. Mars has the largest volcano in the solar system.

C. There is almost no oxygen in the air on Mars.

D. Mars is smaller than the earth, and it is quite a bit cooler.

高一英语阅读理解中等难度题查看答案及解析

The earth is the only planet that scientists think has life. Why does the earth have life while the other planets don’t? For one thing, the earth is just the right temperature. As the third planet from the sun, the earth seems to be just the right distance away. The planets which are closer to the sun are so hot. The farthest planets are cold balls.

When the earth developed—which scientists believe may have happened about 4 billion years ago—many gases covered the earth. The gases caused the earth to be hot. But something wonderful happened. The temperature was just right for thick clouds to form. It rained very hard for a very long time. This gave the earth its oceans. Water made it possible for plants to grow. The plants created oxygen in the atmosphere. Oxygen is the gas that humans and animals breathe.

Only one other planet in the solar system seems to be something like the earth. That planet is Mars(火星). Mars is smaller than the earth, and it is quite a bit cooler. But it is not too cold for humans. On some days, the temperatures are as low as a winter day in the northern United States. If you wore a special spacesuit, you could walk around on Mars. The most difficulty is that you have to bring your own air to breathe, because the air on Mars is too thin to breathe.

Mars has the largest volcano(火山) in the solar system. It is sixteen miles high. The highest volcano on the earth is five miles high. Scientists believe that Mars was once much better than it is now. Does this mean there could have been living things on Mars? Scientists are not sure, but there has been no sign so far.

1.Which of the following is NOT the reason that the earth has life?

A. The earth is just the right temperature.

B. There is oxygen in the atmosphere of the earth.

C. The volcanoes on the earth are lower than those on Mars.

D. The earth seems to be just the right distance away from the sun.

2.The underlined phrase “the third planet” in the first paragraph refers to_______.

A. the Sun　　 B. the Moon

C. the Earth　　 D. the Mars

3.Which of the following about the Mars is NOT true?

A. There is almost no oxygen in the air on Mars.

B. There could have been living things on Mars.

C. Mars has the largest volcano in the solar system.

D. Mars is smaller and quite a bit cooler than the earth.

4.Which is the first trouble for human to live on Mars?

A. The volcanoes.　　 B. The temperature.

C. The air.　　 D. The food.

5.Which of the following is probably the best title for the passage?

A. The Earth　　 B. The Moon

C. Planets in the Solar System　　 D. Mars is Most Like the Earth

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For years scientists have been worried about the effects of air pollution on the earth’s natural conditions.Some believe the air inside many houses may be more dangerous than the air outside.It may be one hundred times worse.

Indoor air pollution can cause a person to feel tired,to suffer eye pain,headache and other problems.Some pollutants(污染物质) can cause breathing disorders,diseases of blood and even cancer.Most scientists agree that every modern house has some kind of indoor pollution.

People have paid more attention to the problem now.It is said that when builders began making houses and offices,they did not waste energy.To do this they built buildings that limited the flow of air between inside and outside.They also began using man-made building materials.These materials are now known to let out harmful gases.

As the problem became more serious,scientists began searching for a way to deal with it.They discovered a natural pollution control system for buildinggreen plants.Scientists do not really know how plants control air pollution.They believe that a plant’s leaves absorb(吸收；吸引) or take in the pollutants.In exchange the plant lets out oxygen through its leaves and small organizations on its roots.Scientists suggest that all buildings should have one large plant or several small plants inside for every nine square meters of space.Studies of different plants show that each absorbs different chemicals.So the most effective(有效的) way to clean the air is to use different kinds of plants.Having green plants inside your house can make it prettier and more healthy place.

1.Generally speaking,indoor air pollution may be more harmful than that outside because _______.

A. indoor air pollution can often make people seriously ill

B. man-made building materials give off dangerous gases

C. there may be more harmful gases outside the buildings

D. the flow of air indoors is limited,which is very harmful

2.Some kind of indoor pollution can be found in _______.

A. every modern house　　 B. every old house

C. all kinds of houses　　 D. all kinds of offices

3.The indoor air pollution is caused by _______.

A. the limit of the flow of air between inside and outside

B. the building way that the builders want to save energy

C. the building things that are made of man-made materials

D. the man-made building materials and the limit of air-flow

4.The reason why we should use different kinds of plants to clean the air is that _______.

A. plants can let out all kinds of pollutants indoors

B. plants may take in more oxygen which people need

C. plants can absorb some kinds of harmful indoor chemicals

D. plants can make our houses prettier and more healthy

高一英语阅读理解中等难度题查看答案及解析

A scientist once said: “I have concluded that the earth is being visited by intelligently controlled vehicles from outer space.”

If we take this as a reasonable explanation for UFOs (unidentified flying objects), questions immediately come up.

“Why don’t they get in touch with us, then? Why don’t they land right on the White House lawn and declare themselves?” people asked.

In reply, scientists say that, while this may be what we want, it may not necessarily be what they want.

“The most likely explanation, it seems to me,” said Dr. Mead, “is that they are simply watching what we are up to—that responsible society outside our solar system is keeping an eye on us to see that we don’t cause a chain reaction that might have unexpected effects for the outside of our solar system.”

Opinions from other scientists might go like this: “Why should they want to get in touch with us? We may feel we’re more important than we really are! They may want to observe us only and not interfere(干涉) with the development of our civilization. They may not care if we see them but they also may not care to say ‘hello’.”

Some scientists have also suggested that Earth is a kind of zoo or wildlife reserve. Just as we set aside wilderness areas and wildlife reserves to allow animals and growing things to develop naturally while we observe them, so perhaps Earth was set aside ages ago for the same purpose.

Are we being observed by intelligent beings from other civilizations in the universe? Are they watching our progress in space travel? Do we live in a huge “zoo” observed by our “keepers,” but having no communication with them?

Never before in our history have we had to face ideas bravely like these. The simple fact is that we, who have always regarded ourselves as supreme in the universe, may not be so. Now we have to recognize that, among the stars in the heavens, there may very well be worlds lived by beings who are to us as we are to ants.

1.People who ask the question “Why don’t they get in touch with us then ?” think that ________.

A. there are no such things as UFOs

B. UFOs are visitors from solar system

C. there’s no reason for UFOs to contact us

D. we are bound to see UFOs sooner or later

2.According to Dr. Mead, the beings from outer space ________.

A. hope to keep in touch with us

B. want to keep watch on us

C. try to protect us from dangers

D. get ready to help others

3.What’s the writer’s attitude towards the existence of other intelligent beings in space?

A. Doubtful B. Neutral C. Negative D. Positive

4.The passage is mostly taken from a(n) ________.

A. commercial advertisement B. science fiction novel

C. newspaper column D. travel leaflet

高一英语阅读理解中等难度题查看答案及解析