题目内容

  The hottest continent, Africa has a lot of resources, ______ are still undeveloped.

A. many of them B. many of whom C. many of it D. many of which

 

D

【解析】

试题分析:本题中两个完整的句子之间没有连词连接,说明不是并列句,而是一个主从复合句。实际上是一个定语从句,先行词是a lot of resources,后面定语从句中的关系代词which指代先行词作为介词of的宾语。句义:最热的大洲,非洲有大量的资源,其中很多仍然没有被开发。A项应该在前面加上butwhom指代的先行词是人,it指代的是单数名词。故只有D项是正确的。

考点:考察定语从句

 

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In most situations, light helps us see. But when it comes to looking at the night sky, light is actually a kind of pollution. It prevents our view of some of lifes most striking sights: stars, planets, and even galaxies(银河系).

When I was a little boy, I loved the night sky. I remember looking up and the sky was filled with stars. I became an astronomer because I was amazed by their beauty, says Robert Gent, Now in most big cities kids cant see the stars like I did.

Normally, about 2,500 individual (单个的) stars are visible to the human eyes without using any special equipment. But because of light pollution, you actually see just 200 to 300 and fewer than a dozen from some cities. Only one in three Americans can see our own galaxy with the naked eyes. Those people live far away from the lights of big cities, office buildings, and shopping malls.

Fortunately, theres an inexpensive and useful way. If we shine lights down at the ground instead of up into the sky, and use lower brightness levels, we can save big amounts of energy and keep the beauty of the night sky. Many cities and towns have passed laws limiting lights at night, making sure enough shine for safety without creating much light pollution.

Light pollution affects more than our view of the heavens and can harm wildlife. Migrating birds(候鸟) sometimes fly over cities and become confused by the brightness, flying in circles until they drop from exhaustion. Sea turtles need dark beaches for nesting and wont approach bright lights. Too much light at night may even affect human health. For all these reasons, researchers are working on ways to use lights only when and where they are truly needed. Everyone deserves to look up at the sky.

1.According to the text, using our naked eyes, ________.

A. people in remote areas can see more stars than those in big cities

B. over one third Americans can see our own galaxy

C. about one in three Americans in big cities can see our own galaxy

D. Americans can only see 200 to 300 stars

2.Many cities and towns have passed laws limiting lights at night mainly to ____________.

A. save the electricity

B. make sure of migrating birds safety

C. let you count the number of stars

D. avoid much light pollution

3.What does the fourth paragraph mainly talk about?

A. The cause of light pollution.

B. The way to reduce light pollution.

C. The effect of light pollution.

D. Peoples attitude towards light pollution.

4.The underlined word exhaustion in the last paragraph means _______ .

A. air pollution B. tiredness C. breath D. brightness

5.Which would be the best title for the text?

A. Light Pollution B. Seeking the Sky C. Stars in the Sky D. City Pollution

 

When we see well, we do not think about our eyes very often. It is only when we cannot see perfectly that we realize how important our eyes are.

People who are near-sighted can only see things that are very close to their eyes. Everything else seems unclear. Many people who do a lot of work, such as writing, reading and sewing become near-sighted.

Then people who are far-sighted endure just the opposite problem. They can see things that are far away, but they have difficulty in reading a book unless they hold it at arm’s length. If they want to do much reading, they must get glasses, too.

Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism(散光). This, too, can be corrected by glasses. Some people’s eyes become cloudy because of cataracts(白内障). Long ago these people often became blind. Now however, it is possible to operate on the cataracts and remove then.

Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle(角度). To prove this to yourself, look at an object out of one eye; then look at the same object out of your other eye. You will find the object’s relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.

1.We should take good care of our eyes .

A. only when we can see well

B. only when we cannot see perfectly

C. only when we are near-sighted or far-sighted

D. even if we can see well or perfectly

2.When things far away seem unclear, one is probably .

A. near-sightedB. far-sighted C. astigmatic D. suffering from cataracts

3.The underlined word endure in the third paragraph probably means .

A. experience B. imagineC. suffer from D. recover from

4.Having two eyes instead of one is particularly useful for .

A. seeing at night B. seeing objects far away

C. looking over a wide area D. judging distances

5.People who suffer from astigmatism have .

A. one eye bigger than the other

B. eyes that are not exactly the right shape

C. a difficulty that can be corrected by an operation

D. an eye difficult that cannot be corrected by glasses.

 

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