问题 选择题

治理黄河水患的问题,措施正确的是:

A.在上游大力发展畜牧业

B.在中游多植树造林

C.在上游多开荒种田

D.在下游多建水电站

答案

答案:B

题目分析:根据黄河上、中、下游的不同特点,因地制宜,综合治理,彻底治理。上游坡陡流急,以修水库、发电、养鱼为主;在中游黄土高原地区开展水土保持综合治理;下游加固黄河大堤。综合以上分析,A、C、D选项错,故选B。

点评:了解黄河产生水患的原因,采取针对性的措施,才能达到好的效果。黄河产生水患的①自然原因:黄土高原土质疏松、暴雨集中、支流众多②人为原因:植被破坏(滥砍滥伐,过渡放牧)。

阅读理解

Howling is a behaviour commonly observed among a wolf pack. As pack animals, wolves work together to hunt and rely on howling as an important means of communication among each other. There are different explanations of a wolf’s howl and it appears that there may be more to discover.

One theory is that wolves howl to bond better together. It’s almost as if howling together helps the pack stay together. Perhaps something similar to people feeling a sense of involvement with each other when singing a song together. But this theory may be wrong, explains Fred H. Harrington, a professor who studies wolf behaviour.

Indeed, there have been times when wolves have been seen one moment howling in a chorus, and the next, quarreling among each other. It appears that usually the lowest-ranking members of the pack may actually be “punished” for joining in the chorus at times. So is howling a way to strengthen a social bond or just a way to reconfirm status among its members? —Why do wolves howl for sure?

What is clear, however, is that howling is often used among packmates to locate each other. Hunting grounds are distant and it happens that wolves may separate from one another at times. When this happens, howling appears to be an excellent means of gathering.

Howling, interestingly, is a contagious behaviour. When one wolf starts to howl, very likely others will follow. This is often seen to occur in the morning, as if wolves were doing some sort of “roll call” where wolves all howl together to report their presence.

小题1:What is the possible similarity between wolves’ howling together and humans’ singing in chorus?

A.The act of calling each other.

B.The sense of accomplishment.

C.The act of hunting for something.

D.The sense of belonging to a group.小题2:Why does Harrington think the “social bond” theory may be wrong?

A.Wolves separate from each other after howling.

B.Wolves tend to protect their hunting grounds.

C.Wolves sometimes have quarrels after howling together.

D.Wolves of low rank are encouraged to join in the chorus.小题3:Researchers are sure that wolves often howl to ______.

A.show their ranks

B.find their companions

C.report the missing ones

D.express their loneliness小题4:“Howling… is a contagious behaviour” (in the last paragraph) means _______.

A.howling is a signal for hunting

B.howling is a way of communication

C.howling often occurs in the morning

D.howling spreads from one to another

单项选择题