Question

根據(jù)短文內(nèi)容，從短文后的選項中選出適當(dāng)?shù)倪x項補(bǔ)全短文。
The earth is about 4,600 million years old. We humans have lived on the earth for only 35,000 years, but during this period we have changed our planet a lot in many ways.    1  
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.
  2  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 (臭氧層).   3 This is very dangerous because it can cause cancer.
Carbon dioxide (CO₂) in the air has increased a lot.   4 it has formed a "blanket" (毛毯) around the each.    5  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 anymore.

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 (O2) called "ozone" (O3). E. It mainly comes from different kinds of burning materials.

Answer 1

小題1:C
小題2:D
小題3:B
小題4:E
小題5:A

短文屬于說明文。短文介紹了對地球造成破壞的兩在問題：臭氧層被破壞和溫室效應(yīng)這，提倡大家保護(hù)地球。
小題1:綜合理解題。承接上一句的“have changed our planet a lot in many ways.”，有積極影響和消極影響。
小題2:綜合理解題。從下一句“a very big hole in the ozone layer”可和這里要介紹的是“臭氧層”。
小題3:綜合理解題。承上啟下，這里所說的是臭氧層被破壞的結(jié)果。
小題4:綜合理解題。上一句提到CO₂的增加，接著講增加的原因及后果。
小題5:綜合理解題。后一句講“溫室效應(yīng)”，那么本句談它形成的原因。