New trees are not looked after properly.
Many trees have been cut down by man.
Man has not paid enough attention to planting trees.
All of the above.
第1题：
Passage Four
The atmosphere and oceans are not the only parts of the environment being damaged. Rain forests are being quickly destroyed as well, and their survival is questionable. E. O. Wilson, a biologist at Harvard, calls the depletion(枯竭、耗尽)of rain forest areas "the greatest extinction since the end of the age of dinosaurs(恐龙)."
Unlike some environmental issues, rain forests' depletion has fortunately received significant public and media's attention. Despite the opposition to the cutting down of rain forests, the problem continues. Every year, Brazil chops down an area of forests the size of the state of Nebraska. In addition to the Amazon's rain forests, many other forests are being cut down as well.: In Indonesia, Zaire, Papua-new Guinea, Malaysia, Burme, the Philippines, Peru, Colombia, Bolivia, and Venezuela, rain forests that were once great have been lost.
According to some estimates, 50 million acres of rain forest are cut down every year. The United Nations says the figure is closer to 17 million acres. The World Wildlife Fund says that every minute,25 to 50 acres are cut down or burnt to the ground.
The world's growing population has been a primary reason of rain forests' destruction. More people need land to live on and wood products to consume. Limiting population growth may be the first in a series of steps that would alleviate the destruction of the rain forests.
48. In the opinion of the author, ______are being destroyed terribly at present.
A. the oceans
B. the atmosphere
C. the rain forests
D. all the above
此题为细节题。从文章的第一段可以看到，作者认为现在大气层、海洋和热带雨林都面临毁灭的威胁。
第2题：
As a news reporter, James __________ many places in the world.
A. has been to
B. has gone to
C. went to
第3题：
A. in all
B. for all
C. above all
D. after all
第4题：
第5题：
A
Why do plants grow in some places and not in others? Why does some land have so much growing on it，while other land has almost no plants growing on it at all?
To grow plants need several things． One is warmth． In very cold places almost nothing grows． Plants also need water． In very dry parts of the earth only a few unusual plants can grow． That's why dry deserts everywhere are almost not covered by trees or grass．
Plants must also have a place in which to f，ut down their roots and grow． They find it diffi-culr to grow on hard land． The town is built on hard land． The plants here have only the soil found between the cracks of the stones Io grow in．
Another thing plants must have before they can grow is food．
Whar will happen if we try to make things grow on the sandy beach? A few plants，such as beach grass，will grow in sand，L ut most plants won-t． Even if the weather is warm enough．and we water the plants each day． Many of them will die because the sand on this beach has al-most no food for plants．
( )21． According to the passage，plants need _________ things to grow well．
A． two
B． three
C． four
D． five
第6题：
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.
此题为三误一正的细节题。见第二段的第一句Unlike some environmental issues，rain forests’depletion has fortunately received significant public and media attention。
第7题：
There are many trees on ______side of the river．
A．both
B．either
C．all
D．a
第8题：
The chief reason why philanthropy has conic into a good stage is that
A． the new money is less likely to be regarded as one's private wealth
B． Gates will devote his full attention to philanthropy
C． the welfare state would take over all the charity responsibilities
D． many new millionaires are self-made rather than inherited
第9题：
第10题：