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阅读短文及文后A～E选项，选出可以填入各题空白处的最佳选项。
The earth is about 4,600 million years old. Human beings have lived on
the earth for several million years, but during this period we have changed our
planet a lot in many ways.
All over the world, people have cut down millions of trees, so more and
more kinds of animals and plants are disappearing. In big cities, cars and
buses have polluted the air. Factories have also polluted the land and the
water.
It
is important to the earth. But now air pollution is destroying it and that has
made a very big hole in the ozone layer (臭氧层)
Carbon dioxide (CO2) in the air has increased a lot.It has formed a "blanket (毛毯)" around the
earth.This makes our earth become warmer and
warmer. Therefore, this causes the level of the ocean to rise.
All these problems are very serious. We must do something to stop our
earth from being polluted.
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A. The heat from
the Sun can't escape, so the temperature is rising.
B. Too much
harmful light from the Sun passes through it and reaches the earth directly.
C. Some things
we've done are very good for the earth while some are bad.
D. Around the
earth, there's a special kind of oxygen called “ozone”.
E. It mainly
comes from different kinds of burning materials.
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