十万火急的英语听力问题Rainforests are the lungs of the planet – storing

十万火急的英语听力问题
Rainforests are the lungs of the planet – storing vast quantities of carbon dioxide and producing a significant amount of the world’s oxygen.Rainforests have their own perfect system for guaranteeing their own survival; the tall trees make a cover of branches and leaves which protect themselves,smaller plants,and the forest animals from heavy rain,dry heat and strong winds.
Amazingly,the trees grow in such a way that their leaves and branches,although close together,never actually touch those of another tree.Scientists think this is a deliberate method to prevent the spread of any tree diseases and make life more difficult for leaf-eating insects.To survive in the forest,animals must climb from tree to tree.The ground floor of the forest is not all covered with leaves and bushes,but is where leaves turn into food for the trees and other forest life.
They are not called rainforests for nothing!Rainforests can produce 75% of their own rain.At least 80 inches of rain a year is normal – and in some areas there may be as much as 430 inches of rain annually.This is real rain.In just two hours,streams can rise ten to twenty feet.
13.How do rainforests manage to survive?
A.By storing large quantities of carbon dioxide.
B.By developing ways to protect themselves.
C.By producing a large amount of oxygen.
15.How much rain can rainforests produce in some areas in a year?
A.About 75％of their own rain.
B.As much as 430 inches.
C.At least 80 inches.