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4.___________ (空气污染)has caused ___________ (太多的)breathing problems.

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When the air in Beijing got " crazy bad", as an American reporter described(描述),one could hardly even see others across the street. During the 1_________,you can usual I  make out (辨认出)the sun through the sky, but even at noon, the sun is just 2_________ a small white ball. Your clothes can get 3_________ after a day's walking. Clothes  4_________ like in an airport smoking waiting-room. 

But it's not just Beijing. On Monday, in Zhejiang Province,south of Shanghai, 800 miles away,a factory was 5 _________fire,but the air pollution was 6_________ bad that for three hours no one noticed the smoke coming out of the factory. To our surprise, Beijing or a town in Zhejiang Province couldn't even 7 _________in China's top 10 cities of the worst air pollution. It's clear that air pollution has become one of China's biggest problems. 8_________ can hurt everyone. Something 9_________ be done to do with the bad air. The Chinese government has taken the first,step to admit(承认)that it is a 10_________ Beijing is able to make its air fresher, so people there can breathe a little easier soon.

(   ) 1. A. day    B. evening C. holiday    D. week

(   ) 2. A. on    B. like C. for    D. over

(   ) 3. A. clean    B. wet  C. dry    D. dirty

(   ) 4. A. touch    B. feel C. smell    D. sound

(   ) 5.A. on    B. in C. at  D.for

(   ) 6. A. such    B. too C. very    D. so

(   ) 7. A. arrive    B. reach C. be    D. get to

(   ) 8. A. One    B. It C. Ones    D. They

(   ) 9. A. may    B. will C. would    D. must

(   ) 10. A. question    B. beginning C. problem    D. key

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