If you travel by air across the center of Africa or South America,you flyover forests for thousands of kilometers.These great forests are the oceans oftrees.There are
thousands and thousands of different kinds of plants and animals.
However,the world's forests are getting smaller all the time.We are cuttingdown the trees because we need wood,and we need more farmland.Some people saythat there will
not be any forests like these in 20 or 30 years.What will happen if theydisappear?
If we cut down our forests,a lot of plants and animals will disappear from theworld.In a lot of places the new farmland will soon look like the olddeserts.Crops will not grow
there.It will not rain very often,and the weather will get very hot.Perhaps theclimate of the world will change.This will be dangerous for everyone in theworld.That is why
we must take care of our forests.
如果你乘飞机穿越非洲或是南美洲的中部，你就可以飞越延绵不绝的森林。这些大森林是树的海洋，里面生长了成千上万种动植物。
但是，一直以来，世界上的森林却在不断减少。因为我们需要木材，因为我们需要更多的农田，所以我们砍掉了一棵又一棵的树。有些人说20或是30年后将不
再有森林了。如果森林消失了，将会发生什么呢？
如果我们砍掉了我们的森林，大量的动植物就会从这个世界上消失。很多地方很快就会沙化看起来像是沙漠。庄稼也长不起来。降雨也会变少，天气会变得异
常炎热。或许世界气候自此就变了。这对世界上的每个人来说都是威胁。那就是为什么我们要保护好我们的森林。
 The passage mainly tells us about the importance of taking care of plants.这篇文章旨在告诉我们保护森林的重要性