题目内容
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If you travel by a1 across the centre of Africa or South America,you fly over forests for thousands of kilometres.These great forests are the oceans of t2 ndline.There are thousands and thousands of different kinds of plants and a3 ndline.
However,the world's forests are getting s4 all the time.In many places,we're cutting down the trees because we need wood and we need more farmland.Some people say that t5 will not be any forests like these in 30 years;what will happen if they d 6 ?
If we cut down our forests,a lot of plants and animals will disappear from the w7 ndline.In a lot of places the new farmland will soon look like the old d8 ndline.Crops will not grow there.It will not rain very often,and the weather will get very hot.P9 the climate of the world will change.This will be dangerous fdr everyone in the world.That's w10 we must take care of our forests.