31页35.Pollution is more and more serious than before .sure .

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31页35.Pollution is more and more serious than before .sure .Peple should ------------cutting trees
A.prevent B.be prevented C.be kept 理由

B
人们应该被阻止砍伐树木.
prevent sb.(from) doing sth.被动形式是be prevent (from) doing sth.其中from可以省略
而如果用keep 则不能省略from 必须说be kept from doing sth.

Air pollution is more serious than water pollution.的意思? the water pollution became more and more serious ( )no furth the pollution here ____becoming more and more serious A.walk China is becoming more and more —— than before . Now the air pollution in this city ( ) more and more serious Water ____ is becoming more and more serious these days. Our hometown is more beautiful than before, Our hometown is more beautiful than before more often than before there (will be) serious air pollution if people use more and What is more serious is we should exercise more and watch less TV than before.