The ozone layer(臭氧層) is a thin layer of gas around the earth. It forms a special “blanket” around the planet. This “blanket” protects the earth from dangerous rays produced by the sun. Without the ozone layer, the earth’s climate could warm to dangerous levels. This increase in temperature would threaten our survival. Scientists recently have discovered a hole in the ozone layer above the Antarctica. Now there is great concern that this warning has started, endangering all life on the earth.
What has destroyed part of the ozone layer? Scientists do not know for sure. They suspect that our popular spray cans (噴漆罐) have played a part in the damage. Many spray cans contain dangerous gases. These gases might have destroyed the ozone layer fifteen miles above the earth’s surface, The chemicals used in refrigerators (冰箱) and air conditioners may contribute to the problem, too.
Many scientists believe that the destruction of the ozone layer is a serious problem for people everywhere. Global warming could change weather patterns around the world. Farmers and ranchers(牧場主) could find it more and more difficult to produce enough food for the earth’s people. If more of the sun’s dangerous rays reached the earth, there also could be an increase in skin cancers. Some skin cancers might cause people to die. Although some scientists do not believe there is a serious danger, obviously no one wants to take any chance on such a possibility.
Can scientists repair the hole in the ozone layer? They really don’t know the answer to that question. Can people do anything to save the ozone layer that the earth still has? Scientists stress the need to limit the use of spray cans and other items that contain the dangerous gases. This will not be an easy task. People all over the world use these items. Solving the problem certainly will require commitment and cooperation from everyone.
小題1:The ozone layer exists to _____.
A．warm the earth to a proper level for life
B．protect the earth from dangerous sun rays
C．make all life on the earth in a dangerous situation
D．prevent human beings from being harmed from the earth
小題2:Which of the following statements is TRUE according to the passage?
A．Scientists aren’t sure what has destroyed part of the ozone layer.
B．Scientists recently have discovered a hole in the Antarctica.
C．Scientists prove that spray cans have destroyed part of the ozone layer.
D．Global warming doesn’t affect weather patterns around the world.
小題3: The following may do harm to the ozone layer EXCEPT ______.
A．spray cansB．refrigeratorsC．ranchersD．a(chǎn)ir conditioners
小題4: Saving the ozone layer needs everyone’s effort because _____.
A．scientists are badly in need of others’ help
B．items containing dangerous gases should be forbidden
C．scientists can’t afford so much money to take measures
D．people all over the world use items containing dangerous gases

小題1:B
小題2:A
小題3:C
小題4:D

試題分析：臭氧層是地球最好的保護傘，它吸收了來自太陽的大部分紫外線。臭氧層空洞的擴大將導致紫外線輻射加強，這不僅會嚴重破壞地球表面生態(tài)環(huán)境，同時也會增加人類患皮膚癌的危險。
小題1:細節(jié)題：從第一段的句子：This “blanket” protects the earth from dangerous rays produced by the sun. 可知臭氧層是用來保護地球免受太陽的有危險的光的傷害。選B
小題2:細節(jié)題：從第二段的句子：What has destroyed part of the ozone layer? Scientists do not know for sure. 可知科學家還不知道是什么破壞了臭氧層的一部分，選A
小題3:細節(jié)題：從第二段的句子：They suspect that our popular spray cans (噴漆罐) have played a part in the damage. 和The chemicals used in refrigerators (冰箱) and air conditioners may contribute to the problem, too. 可知噴漆罐，冰箱和空調(diào)都有可能破壞臭氧層，沒有提到ranchers，選C
小題4:細節(jié)題：從最后一段的句子：People all over the world use these items. Solving the problem certainly will require commitment and cooperation from everyone. 可知保護臭氧層人人有責，因為人人都在用含有危險氣體的東西。選D
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