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提问人：网友superjunjun 发布时间：2022-01-07

[主观题]

What makes it rain？ Rain falls from clouds for the same reason anything falls to Earth. Th

e Earth's Gravity(重力) 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(束) of sunlight. To the casual observer, dust seems to act in a totally random fashion, moving about wildly 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. (78)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 a diameter of 1/125 inch or larger can it fall form. 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.

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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更多“What makes it rain？ Rain falls from clouds for the same reason anything falls to Earth. Th”相关的问题

第1题

Suppose that a product benefits from a successful advertising campaign. The result is that:

A、the demand for the product increases.

B、the demand for the product decreases.

C、the supply of the product increases.

D、the supply of the product decreases.

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第2题

根据以下材料回答题

We experience different forms of the sun' s energy every day．The sun is the major source ofenergy for our planet．It causes the evaporation (蒸发) of water from the oceans and lakes．Sun-light also provides the energy used by green plants to make their own food．

Much of the energy that comes from the sun never reaches the earth' s surface．It is either re-fleeted or absorbed by the gases in the upper atmosphere．Of the energy that reaches the lower at-mosphere, 30% is reflected by clouds or the earth' s surface．The remaining 70% warms the surfaceof the planet, causes water to evaporate, and provides energy for the water cycle and weather．

Only a tiny part, approximately 0．023%, is actually used by green plants to produce food．

Many gases found in the atmosphere actually reflect heat energy escaping from the earth' s sur-face back to the earth．These gases act like the glass of a greenhouse in that they allow energy fromthe sun to enter but prevent energy form. leaving．They are therefore called greenhouse gases．

When sunlight strikes an object, some of the energy is absorbed and some is reflected．Theamount reflected depends on the surface．Dark-colored surfaces, such as dark soil or forest, absorbmore energy．

According to the passage， the root cause for weather changes on the earth is __________．查看材料

A.the atmosphere surrounding the earth

B.water from oceans and lakes

C.energy from the sun

D.greenhouse gases in the sky

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第3题

In the compressed history of Earth the Declaration of Independence is signed______.A.a lon

In the compressed history of Earth the Declaration of Independence is signed______.

A．a long time before the New Year

B．immediately after the New Year's Day

C．just one second before the New Year

D．right on the New Year's Day

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第4题

Ernest Miller Hemingway was born on July 21, 1899 in Oak Park, Illinois. In the nearly sixty two years of his life that followed, he built a literary fame unsurpassed (无法超越)in the twentieth century.

As a boy he was taught by his father to hunt and fish along the shores and in the forests around Lake Michigan. The Hemingways had a summer house in northern Michigan, and the family would spend the summer months there trying to stay cool. Hemingway would either fish the different streams that ran into the lake, or would take the small boat out to do some fishing there. He would also go squirrel hunting in the woods, discovering early in life the peace to be found while alone in the forest or going through a stream. It was something he could always go back to throughout his life, and though he often found himself living in major cities like Chicago, Toronto and Paris early in his life, once he became successful he chose somewhat isolated places to live in.

When he wasn't hunting or fishing his mother taught him the good points of music. She was a skilled singer who once had wished a life on stage, but at last settled down with her husband and spent her time by giving voice and music lessons to local children, including her own. Hemingway was never talented for music and suffered through singing practices and music lessons, however, the musical knowledge he got from his mother helped him share in his first wife Hadley's interest in the piano.

Ernest Hemingway died in______.

A．1969

B．1979

C．1981

D．1961

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第5题

Lynd and hundreds of young people like him ______ the post of typist.A.approachedB.applied

Lynd and hundreds of young people like him ______ the post of typist.

A．approached

B．applied for

C．appealed to

D．approved of

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第6题

Nowadays little knowledge __ to be a dangerous thingA.seemB.seemedC.does seemD.do seem

Nowadays little knowledge __ to be a dangerous thing

A.seem

B.seemed

C.does seem

D.do seem

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第7题

We got up early this morning and【56】a long walk after breakfast. We walked【57】the business section of the city. I told you yesterday that the city【58】larger than I thought it would be. Well, the business section is smaller than I thought it would be. I suppose that's【59】Washington is a special kind of city.【60】of the people in Washington work for the government.

About 9:30 we went to the White House. It's【61】the public from ten【62】twelve, and there was a long line of people【63】to get in. We didn't have to wait very long, because the line moved pretty quickly.

The White House is really white. It【64】every year. And it seems very white, because it's got beautiful lawns【65】around it, with many trees and shrubs. The grounds【66】about four square blocks. I mean, they' re about two blocks long【67】each side.

Of course, we didn't see the whole building. The part【68】the president lives and works can not be visited by the public. But the part we saw was beautiful. We went through five of the main rooms. One of【69】was the library, on the ground floor. On the next floor, there are three rooms named【70】the colors that are used in them: the Red Room, the Blue Room, and the Green Room. The walls are covered with silk【71】There are【72】old furniture, from the time【73】the White House was【74】built. And everywhere there are paintings and statues of former presidents and【75】famous people from history.

(56)

A．made

B．took

C．did

D．set

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第8题

The passage is mainly about______A.lifelong training of employeesB.policies of lifelong em

The passage is mainly about______

A．lifelong training of employees

B．policies of lifelong employment

C．attitudes towards lifelong employment

D．employers' interest in lifelong employment

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第9题

How did the author feel when Jennie told her she had broken up with her boy friend?A.She f

How did the author feel when Jennie told her she had broken up with her boy friend?

A．She felt relived.

B．She felt happy and proud.

C．She felt frustrated and angry.

D．She felt exhausted.

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