题目内容：

Today tropical rainforests are disappearing from the face of the globe. Despite growing international concern, rainforests continue to be destroyed at a pace over 80,000 acres per day. World rainforest cover now stands at around 2.5million square miles. Human activities have had an effect on much of this remaining area.

Deforestation(森林滥伐) of tropical rainforests has a global effect through species extinction, the loss of important ecosystem services and renewable resources, and the reduction of carbon sinks. However, this destruction can be slowed, stopped, and in some cases even reversed(逆转). Most people agree that the problem must be solved, but the means are not as simple as building fences around the remaining rainforests or banning the wood trade. Economic, political, and social pressures will not allow rainforests to continue to exist if they are completely closed off from use and development.

So, what should be done? The solution must be based on what is practical, not completely idealistic and depends on developing a conservation approach built on the principle of sustainable(可持续的) use and development of rainforests. Beyond the responsible development of rainforests, efforts to restore damaged forest lands along with the establishment of protected areas are key to securing rainforests for the long-term benefits they can provide for mankind.

Historic approaches to rainforest conservation have failed, as shown by the increased rate of deforestation. In many regions, closing off forests as untouchable parks and reserves has neither improved the quality of living or economic opportunities for the rural poor, nor stopped forest clearing by illegal woodcutters and developers.

The problem with this traditional approach to preserving wildlands in developing countries is that it fails to develop proper economic motives for preserving the forest. Local people and the government itself must see financial returns to prove the costs of maintaining parks from economic activities.

1.What has caused some species extinction in the tropical rainforests?

A. Humans' destroying the trees.

B. Carbon sinks being reduced.

C. Lacking renewable resources.

D. Fences not being built around the rainforests.

2.What can be inferred from the passage?

A. Tropical rainforests can be easily preserved.

B. Rainforests must be closed off to be better protected.

C. Human activities have had an effect on tropical rainforests.

D. Economic returns can make some difference in protecting tropical rainforests.

3.What is the author's attitude to tropical rainforest protection?

A. Indifferent.

B. Concerned.

C. Doubtful.

D. Puzzled.

4.What is the purpose of the passage?

A. To show the bad effects of deforestation.

B. To stress the importance of the rainforests.

C. To appeal for right ways to save the rainforests.

D. To introduce the fact of forests disappearing.