问题
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Air pollution People and air pollution are often in the same places. This means that cities with large populations have the biggest problem of dirty air. Air pollution is caused by many different thi
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The second paragraph deals mainly with ______ in America.A.the rapid growth of urban popul
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The Northeast, with 60 million people, is the most______populated part of the United State
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What can people do with the rate of population growth?A.People can do nothing about it.B.P
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Which city is known as "City of Sails"?A.Auckland.B.Edinburgh.C.Melbourne.D.Perth.
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Which is the capital city of Australia?A.Canberra.B.Melbourne.C.Sydney.D.Perth.
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