问题 选择题

下列哪三项被公认为世界三大环境问题(  )

①酸雨      ②臭氧层被破坏      ③汽车尾气污染      ④温室效应.

A.①②③

B.②③④

C.①②④

D.①③④

答案

①造成酸雨的主要气体是二氧化硫,二氧化硫主要来源于煤、石油等燃料的燃烧,工厂排放的废气等.

②含氟的化合物会破坏臭氧层,含氟的化合物主要是在冰箱、空调中的一些制冷剂等.

③汽车尾气含有二氧化硫、氮氧化物等有害气体,会造成酸雨.

④二氧化碳是造成温室效应的主要气体,主要来自化石燃料的大量使用.要想减少温室气体的排放,就要开发新能源.

因此,被公认为世界三大环境问题是酸雨、臭氧层破坏、温室效应.

故选:C.

判断题
阅读理解

For many parents, raising a teenager is like fighting a long war, but years go by without any clear winner. Like a border conflict(冲突)between neighboring countries, the parent-teen war is about boundaries: Where is the line between what I control and what you do?

Both sides want peace, but neither feels it has any power to stop the conflict. In part,this is because neither is willing to admit any responsibility for starting it. From the parents’ point of view, the only cause of their fight is their adolescents’ (青少年)complete unreasonableness. And of course, the teens see it in exactly the same way, except oppositely. Both feel trapped.

In this article, I’ll describe three no-win situations that commonly arise between teens and parents and then suggest some ways out of the trap. The first no-win situation is quarrel on unimportant things. Examples include the color of the teen’s hair, the cleanness of the bedroom, the preferred style of clothing, the child’s failure to eat a good breakfast before school, or his tendency to sleep until noon on the weekends. Second, blaming. The goal of a blaming battle is to make the other admit that his bad attitude is the reason why everything goes wrong. Third, needing to be right. It doesn’t matter what the topic is—politics, the laws of physics, or the proper way to break an egg—the point of these arguments is to prove that you are right and the other person is wrong,for both wish to be considered an authority—someone who actually knows something—and therefore to command respect. Unfortunately, as long as parents and teens continue to assume that they know more than the other, they’ll continue to fight these battles forever and never make any real progress.

小题1:Why does the author compare the parent teen war to a border conflict?

A.Both can continue for generations.

B.Both are about where to draw the line.

C.Neither has any clear winner.

D.Neither can be put to an end.小题2:What does the underlined part in Paragraph 2 mean?

A.The teens blame their parents for starting the conflict.

B.The teens agree with their parents on the cause of the conflict.

C.The teens accuse their parents of misleading them.

D.The teens tend to have a full understanding of their parents.小题3:Parents and teens want to be right because they want to__________.  

A.give orders to the other

B.know more than the other

C.gain respect from the other

D.get the other to behave properly小题4:What will the author most probably discuss in the paragraph that follows?

A.Causes for the parent-teen conflicts

B.Examples of the parent-teen war

C.Solutions for the parent-teen problems

D.Future of the parent-teen relationship