题目内容：

选择方框里词的适当形式填空。

over ,   earth  ,  thousand , to  , wet

Rainforests cover 6 % of the 1. surface. Many animals live in rainforests. Quite a lot of them live in the trees 　2.　　30 meters from the ground. There are lots of tall trees and   3.　of other different plants. It’s always dark and hot in rainforests and the ground is always 4.  .

Rainforests are very important 5.   us. They are the lungs of the earth. The plants in the forests help to make the air fresher.