The first small plants multiplied and filled the oceans and seas with oxygen. This encouraged the later __6__ (develop) of early shellfish and fish. Land animals such as insects, reptiles and dinosaurs and so on appeared after green plant appeared. Small clever animals __7__ (spread) all over the earth. They are putting too much carbon dioxide into the atmosphere, which prevents heat __8__ the earth into space. __9__ life will continue on the earth for millions of years to come will depend __10__ whether this problem can be solved.
答案
1.dust 2.in 3.which 4.down 5.harmful
6.development 7.spread 8.from 9.Whether 10.on
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