The ozone layer(臭氧层) is a thin layer of gas around the earth. It forms a special “blanket”

The ozone layer(臭氧层) 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 (喷漆罐) 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(牧场主) 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.
【小题1】The ozone layer exists to . A．warm the earth to a proper level for life B．protect the earth from dangerous sun raysC．make all life on the earth in a dangerous situation D．prevent human beings from being harmed from the earth【小题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.【小题3】 The following may do harm to the ozone layer EXCEPT . A．spray cansB．refrigeratorsC．ranchersD．air conditioners【小题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 forbiddenC．scientists can’t afford so much money to take measuresD．people all over the world use items containing dangerous gasesB

(答案→)B 解析：臭氧层是地球最好的保护伞，它吸收了来自太阳的大部分紫外线。臭氧层空洞的扩大将导致紫外线辐射加强，这不仅会严重破坏地球表面生态环境，同时也会增加人类患皮肤癌的危险。【小题1】细节题：从第一段的句子：This “blanket” protects the earth from dangerous rays produced by the sun. 可知臭氧层是用来保护地球免受太阳的有危险的光的伤害。选B【小题2】细节题：从第二段的句子：What has destroyed part of the ozone layer? Scientists do not know for sure. 可知科学家还不知道是什么破坏了臭氧层的一部分，选A【小题3】细节题：从第二段的句子：They suspect that our popular spray cans (喷漆罐) have played a part in the damage. 和The chemicals used in refrigerators (冰箱) and air conditioners may contribute to the problem, too. 可知喷漆罐，冰箱和空调都有可能破坏臭氧层，没有提到ranchers，选C【小题4】细节题：从最后一段的句子：People all over the world use these items. Solving the problem certainly will require commitment and cooperation from everyone. 可知保护臭氧层人人有责，因为人人都在用含有危险气体的东西。选D

我明天再问问老师，叫他解释下这个问题