A.a(chǎn) long time ago, man didn't know how to make use of wood |
B.trees are not as useful as they were in the past |
C.trees were more found in the past than they are today |
D.people have always found trees useful |
A.the land would become better | B.heavy rains would be very clean |
C.the rich soil couldn't be kept | D.there wouldn't be any plants |
A.do nothing to keep the balance(平衡)of nature |
B.take his best to keep the balance of nature |
C.try his best to keep the balance of nature |
D.do his best to stop the balance of nature |
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A.man is covering huge areas with new kinds of plants |
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A.some common and hardy kind of bird multiplies |
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