5. 過去常有很多鳥兒在樹林里唱歌.。

There many birds singing in the woods.

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II.從方框中選出合適的短語,并用其適當形式填空

take part in,pay for,turn off,play a part in,make a difference,be good for,bring back,so far

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A [2015 • 十堰]

Almost a seventh of China has been under heavy smog. The air pollution in 20 cities has reached “danger level”. China is not alone,however. Many countries have the same situation. The air pollution is a problem from which we can't hide.

The United States Since the beginning of the 19th century,America has had trouble with environmental problems,air pollution in particular. Almost 60  percent of Americans live in areas,where air pollution has reached unhealthy levels. It can make people sick.

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枏據(jù)短文內(nèi)容,完成下面表格。

World Battles Against Air Pollution

China

As for the air pollution,China is not 1. ; many countries have the same situation.

The United States

About 60 percent of Americans live in areas,where 2. has reached unhealthy levels.

The Environmental Protection Agency 3. by the US in 1970.

London

In 1952,the 4. smog shocked the world.

New Delhi

Because New Delhi is developing fast. Its air quality is even 5.

than that of Chinese cities.

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I told her to come back to.

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