What makes it rain？ Rain falls from clouds for the same reas..

第1题

What makes rain fall？A．Air currents' movement.B．The earth gravity.C．Droplets' movementD．Th

What makes rain fall？

A．Air currents' movement.

B．The earth gravity.

C．Droplets' movement

D．The size of the droplets

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第2题

When you are near a lake or a river, you feel cool. Why？ The sun makes the earth hot, but

it can't make the water very hot. Although the air over the earth becomes hot, the air over the water stays cool. The hot air over the earth rises. Then the cool air over the water moves in and takes the place of the hot air. Then you feel the cool air and the wind, which makes you cool.

Of course, scientists can't answer all of your questions. If we ask, "Why is the ocean full of salt？" scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into the cracks. The rain then carries the salt into he earth and into the rivers. The rivers carry the salt into the ocean. But then we ask, "What happens to the salt in the ocean？ The ocean doesn't get more slat every year." Scientists are not sure about the answer to this question.

We know a lot about our world. But there are still many answers that we do not have, and we are curious.

The main idea of this passage is ______.

A．people feel cool when they are near a lake or river

B．scientists can explain everything we want to know

C．scientists can explain many things but not everything

D．the salt in the ocean comes from rocks

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第3题

When you are near a lake or a river, you feel cool. Why？ The sun makes the earth hot, but

it can't make the water very hot. Although the air over the earth becomes hot, the air over the water stays cool. The hot air over the earth rises. Then the cool air over the water moves in and takes the place of the hot air. Then you feel the cool air and the wind, which makes you cool.

Of course, scientists can't answer all of your questions. If we ask, "Why is the ocean full of salty" scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into the cracks. The rain then carries the salt into he earth and into the rivers. The rivers carry the salt into the ocean. But then we ask, "What happens to the salt in the ocean？ The ocean doesn't get more slat every year". Scientists are not sure about the answer to this question.

We know a lot about our world. But there are still many answers that we do not have, and we are curious.

The main idea of this passage is ______.

A．people feel cool when they are near a lake or river

B．scientists can explain everything we want to know

C．scientists can explain many things but not everything

D．the salt in the ocean comes from rocks

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第4题

SECTION BPASSAGESDirections: In this section, you will hear several passages. Listen to th

SECTION B PASSAGES

Directions: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.

听力原文： What makes it rain？ Rain falls from clouds for the same reason anything falls to Earth. The Earth's gravity pulls it. But every cloud is made of water droplets or ice crystals. Why doesn't rain or snow fall constantly from all clouds？ The droplets or ice crystals in clouds are exceedingly small. The effect of gravity on them is minute. Air currents move and lift droplets so that the net downward displacement is zero, even though the droplets are in constant motion.

Droplets and ice crystals behave somewhat like dust in the air made visible in a shaft of sunlight. To the casual observer, dust seems to act in a totally random fashion, moving about chaotically without fixed direction. But in fact dust particles are much larger than water droplets and they finally fall. The cloud droplet of average size is only 1/2, 500 inch in diameter. It is so small that it would take sixteen hours to fall a mile in perfectly still air, and it does not fall out of moving air at all. Only when the droplet grows to a diameter of 1/125 inch or larger can it fall from the cloud. The average raindrop contains a million times as much water as a tiny cloud droplet. The growth of a cloud droplet to a size large enough to fall out is the cause of rain and other forms of precipitation. This important growth process is called "coalescence".

What is the main topic of the passage？

A．The mechanics of rain.

B．The climate of North America.

C．How gravity affects air current.

D．Types of clouds.

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第5题

SECTION BPASSAGESDirections: In this section, you will hear several passages. Listen to th

SECTION B PASSAGES

Directions: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.

听力原文： What makes it rain.9 Rain falls from clouds for the same reason anything falls to Earth. The Earth's gravity pulls it. But every cloud is made of water droplets or ice crystals. Why doesn't rain or snow fall constantly from all clouds？ The droplets or ice crystals in clouds are exceedingly small. The effect of gravity on them is minute. Air currents move and lift droplets so that the net downward displacement is zero, even though the droplets are in constant motion.

Droplets and ice crystals behave somewhat like dust in the air made visible in a shaft of sunlight. To the casual observer, dust seems to act in a totally random fashion, moving about chaotically without fixed direction. But in fact dust particles are much larger than water droplets and they finally fall. The cloud droplet of average size is only 1/2500 inch in diameter. It is so small that it would take sixteen hours to fall a mile in perfectly still air, and it does not fall out of moving air at all. Only when the droplet grows to a diameter of 1/125 inch or larger can it fall from the cloud. The average raindrop contains a million times as much water as a tiny cloud droplet. The growth of a cloud droplet to a size large enough to fall out is the cause of rain and other forms of precipitation. This important growth process is called "coalescence".

What is the main topic of the passage？

A．The mechanics of rain.

B．The climate of North America.

C．How gravity affects air current.

D．Types of clouds.

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第6题

The acid rain destroys the protection on tree leaves, which makes the plants more vulnerab

le to disease.

A．Y

B．N

C．NG

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第7题

根据下列材料，请回答下列各题： Questions 61 to 65 are based on the following passage. Recent

ly the Barbican museum in London held an exhibition called the Rain Room. During the time this exhibition was open, my Twitter stream was filled with photos of people standing in the Rain Room, accompanied by the caption(标题) “Rain Room @ The Barbican!” and a location attachment to prove that they were indeed in the Rain Room. This got me thinking. What were people actually saying by Tweeting about their visit？ I think all they were doing was meeting the obligation that we have to share. Not sharing in the sense of treasuring a moment with people close to us, but sharing in the sense of "notify the world that I am doing a thing". Its not sharing; its showing off. When we log in to Facebook or Twitter we see an infinitely updating tream of people enjoying themselves. Its not real life, because people only post about the good things whereas all the dull or deep stuff doesnt get mentioned. But despite this obvious fact, it subconsciously makes us feel like everyone is having a better time than us. This is the curse of our age. We walk around with the tools to capture extensive data about our surroundings and transmit them in real-time to every acquaintance weve made. We end "up with adimin is hed perception of reality because were more concerned about choosing a good Instagram filter for our meal than how it tastes. I dont that that its inherently wrong to want to keep the world updated about what youre doing. But when you go through life robotically posting about everything you do, youre not a human being. Youre just a prism(棱镜) that takes bits of light and sound and channels them into the Cloud. The key thing to remember is that you are not enriching your experiences by sharing them online; youre detracting (转移) from them because all your efforts are focused on making them look attractive too they people. Once you stop seeing things through the eyes of the people following you on Twitter or Facebook or instagram, you can make your experiences significant, because you were there and you saw the sights and smelled the smells and heard the sounds, not because, you snapped a photo of it through a half-inch camera lens. What do we learn from the first two paragraphs？

A.Rain Room exhibition received a large audience in London.

B.Most of people feel obligated to share their experience with Mends.

C.Many people want to notify others of their experience by Tweeting.

D.All people having gone to the Rain Room took pictures.

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第8题

A．It reflects little of the sun heat and makes the weather warmer.B．It reflects much o

A．It reflects little of the sun heat and makes the weather warmer.

B．It reflects much of the sun heat and makes the weather colder.

C．It makes the rain impossible and the weather dry.

D．It makes the light and heat intense at the equator.

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第9题

Why does rain produce a lot of mosquitoes？A．Mosquitoes can find enough food in rainy seaso

Why does rain produce a lot of mosquitoes？

A．Mosquitoes can find enough food in rainy season.

B．Rain makes grass grow fast.

C．Rain provides a good living condition for mosquitoes.

D．Rain provides an abundant supply of water.

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第10题

Passage OneAlice Walker makes her living by writing, and her poems, short stories, and nov

Passage One

Alice Walker makes her living by writing, and her poems, short stories, and novels have won many awards and fellowships for her. She was born in Eatonton, Georgia. She went to public schools there, and then to Spelman college in Atlanta before coming to New York to attend Sarah Lawrence College, from which she graduated in 1966. For a time she lived in Jackson, Mississippi with her lawyer husband and small daughter. About Langston Hughes, American Poet, her first book for children, she ,says, "After first meeting with Langston Hughes I vowed I would write a book about him for children someday. Why？ Because I, at twenty-two, knew next to nothing of his work, and he didn't scold me: he just gave me a stack of his books. And he was kind to me; I will always be grateful that in his absolute warmth and generosity he fulfilled my deepest dream (and need) of what a poet should be.

"To me he is not dead at all. Hardly a day goes by that I don't think of him or speak of him. Once, just before he died, when he was sick with the flu, I Look him a sack full of oranges. The joy I felt in giving that simple gift is undiminished by dine. He said he liked oranges, too."

Passage Two

What makes it rain？ Rain falls from cloud for the same reason anything falls to Earth. The Earth's gravity pulls it But every cloud is made of water droplets or ice crystals. Why doesn't mm or snow fall constantly from all clouds？ The droplets or ice crystals in clouds are exceedingly small. The effect or gravity on them is minute. Air currents move and lift droplets so that the net downward displacement is zero, even though the droplets are in constant motion.

Droplets and ice crystals that behave somewhat like dust in the air make sunlight visible. To the casual observer, dust seems to act in a totally random fashion, moving about chaotically without fixed direction. But in fact dost particles are much larger than water droplets and they finally fall. The average size of a cloud droplet is only 0.0004 inch in diameter. It is so small that it would take sixteen hours to fall half a mile in perfectly still air, and it does not fall out of moving air at all. Only when the droplet grows to diameter of 0.008 inch or larger can it fall from the cloud. The average raindrop contains a million times as much water as a tiny cloud droplet. The growth of a cloud droplet to a size large enough to fall out is the cause of rain and other forms of precipitation. This important growth process is called "coalescence".

Passage Three

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In the passage, Alice Walker is described as an author of plays for children.

A．Y

B．N

C．NG

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