问题 选择题

环境问题已成为制约社会发展和进步的严重问题.有下列几种说法:①臭氧层的主要作用是吸收紫外线;②温室效应将导致全球气候变暖;③酸雨主要是由于空气受到硫的氧化物和氮的氧化物污染所致;④光化学烟雾主要是由汽车尾气引起的.其中正确的是(  )

A.①②

B.②③

C.①③

D.①②③④

答案

臭氧层具有吸收紫外线的功能,故①正确,温室效应将导致全球气候变暖,故②正确,酸雨分为硫酸型酸雨和硝酸型酸雨,故③正确,光化学烟雾主要是由汽车尾气引起的,故④正确,故选D.

阅读理解

Bob was cutting a branch(树枝) off a tree in his garden. While he was sawing(锯), another man passed in the street. He stopped and said, “ Excuse me, but if you continue (继续)to saw(锯) that branch like that, you will fall down with it.” He said this because Bob was sitting on the branch and cutting it at a place between himself and the trunk(树干) of the tree.

Bob said nothing. He thought, “ This is some foolish(愚笨的) person who has no work to do and goes about telling other people what to do and what not to do.”

The man continued on his way. Of course, after a few minutes. The branch fell and Bob fell with it.

“My God!” he cried. “That man knows the future!” and he ran after him to ask how long he was going to live. But the man had gone.

小题1:One day Bob was cutting a branch_______a tree in his garden.

A.on

B.in

C.at

D.off小题2:While Bob was sawing, another man_______.

A.told him to stop working  

B.told him he would fall down

C.would borrow something from him  

D.would help him saw that branch小题3:After hearing the man’s words, Bob thought that________.

A.that was a foolish person.  

B.that was a wise person

C.that was a proud person

D.that fellow cheated him小题4:What happened to Bob after a few minutes?

A. The branch fell.             B. Bob fell down to the ground.

C. Bob was hurt himself.             D. Both A and B.

小题5:This story is about ________.

A.a foolish man

B.a wise man

C.cutting a tree

D.that we need to take good advice

单项选择题