【正文】
( 完形填空)Sandstorms in AsiaSandstorms have been a 1 2 for many Asian countries for centuries. Scientists have tried many ways to 3 this problem and in China, a 4 ___ has been started to help solve it.Sandstorms are strong, 5 winds that carry sand. They are often so 6 that you cannot see the sun, and the wind is sometimes strong enough to move sand 7 . The four main places in the world 8 there are sandstorms are Central Asia, North America, Central Africa and Australia. Ren Jianbo, from Inner Mongolia described a terrible sandstorm he 9 as a child in the desert. To have been 10 in a sandstorm was a terrible experience, he said. There was nothing to be done. It was the most 11 and the most dangerous situation I39。t forget _________ the letter.A. to send B. send C. sending D. being sent2. The chair looks very old, but in fact it is very fortable to _________.A. sit B. sit on C. be sat D. be sat on 3. Is ______ necessary to return the book tomorrow?A. this B. that C. it D. which4. I39。s too hard ________ (do) it by myself. takes about two hours ________ (get to) the station.39。t be ( 21 )_______, really.Interviewer:We should (22) ___________garbage, not burn it.David:Of course we should.Interviewer:It39。s (9) ________ that39。t we? Hotter summers, warmer winters, that kind of thing.David:Yes, we have. Also, scientists have found that the ice at the Poles is beginning to (5) .Interviewer:We39。ve heard that too. Is that really happening?David:Yes, I39。s the problem. Gases from cars enter the (10)_____________ and stop the sun39。s strange, we know all this, and yet we do nothing but talk about it. I can39。s ti