题目内容
（请给出正确答案）
Rain forests play a vital role in helping the earth extract carbon dioxide from the air.
A．Y
B．N
C．NG
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更多“Rain forests play a vital role in helping the earth extract carbon dioxide from the air.A．”相关的问题
A．Some important medicines are from the rain forests.
B．Disappearing forests, will not affect the world's temperature.
C．Almost half of the world's wildlife can be found in the rain forests.
D．The rain forests provide man with food resources.
According to the speaker, the rain forests are important for ______ reasons.
A．two
B．three
C．four
Which of the following is the ultimate reason for the decline of tropical rain forests？
A．Unfavorable climate.
B．Human abuse of forests.
C．Increase in the temperature.
D．Unusual rainfalls.
听力原文： Human beings are cutting down the world's rain forests at the rate of 20 hectares a minute (31) . Every year, 30 million hectares of rain forests are destroyed. And at this rate, most of the world's rain forests will disappear very soon.
The forests are cut down sometimes for wood, sometimes for farms so that crops and vegetables can be planted and sometimes to make way for roads. But the forests do not re-grow. The soil is very thin and it is soon washed away by the rain. The land is then too poor for the forests to begin to grow again.
There are a number of good reasons for saving the rainforests. Several important drugs in hospitals have come from the rain forests. Also they produce food. The rain forests are rich in wildlife, too. They cover less than 10% of the world's land, but they contain 40%～50%of the world's species of plants and animals (29) . The trees supply oxygen. If the rain forests are destroyed, this will change the world's weather (30) . Temperatures will go up, sea levels will rise and there will be changes in rain and snowfall.
Today, research studies in forests in Panama, New Guinea and Indonesia may help us to find solutions to save the world's rain forests.
(30)
A．15%.
B．10%.
C．About 50%.
D．Nearly 30%.
The reason why they made rain forests the priority is ______ .
A．increasing population
B．money shortage
C．time limitation
A．Right
B．Wrong
C．Not mentioned
The______ of rain forests may hamper a developing country in its fight against poverty.
A．reservation
B．preservation
C．conservation
D．compensation
Rain forests are important to all countries because people depend on them for ______ .
A．their livelihood and the quality of the environment
B．their livelihood
C．the quality of the environment
Which the following statements is TRUE according to the passage？
A. The United Nations says about 50 million acres of rain forests are cut down every year.
B. Luckily people and the mass media all paid special attention to the depletion of rain forests.
C. The author thought the oceans' survival is questionable.
D. People have stopped cutting down rain forests because of the opposition of most people.
To protect the rain forests, the prime job is to ______ .
A．collect money to plant more trees
B．stop cutting down trees
C．try and get people to understand this issue
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