问题 选择题

夏季风的进退会影响我国大陆东部雨带的推移,当夏季风弱时,可能出现的现象是(  )

A.南北皆涝

B.南旱北涝

C.南北皆旱

D.南涝北旱

答案

中国东南部广大地区由于受季风影响,降水以季风雨为主,降水的地区分布也不均匀,东部近海多雨,西部干旱少雨;南方比北方多雨;中国东南部地区受季风影响,雨季起迄规律性明显.一般的来说雨季开始南方早、北方迟,东部早、西部迟,雨季结束北方早、南方迟,西部早、东部迟,但是由于夏季风的强弱不稳定,导致容易出现旱涝灾害,如果夏季风势力强,前进速度快,到达北方时间较早、徘徊时间长,就会导致北方地区降水偏多,出现北涝南旱;如果夏季风弱时,则前进速度慢,在南方徘徊时间较长,导致南方降水偏多,出现南涝北旱.

故选:D.

填空题
阅读理解

阅读理解。

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     We can read of things that happened 5.000 years ago in the Near East, where people first learned to write.

   1   The only way that they can preserve their history is to recount it as sagas-  2   These legends are useful

because they can tell us something about migrations of people who lived long ago, but none could write down

what they did. Anthropologists(人类学家) wondered where the remote ancestors of the Polynesian peoples

now living in the Pacific Islands came from.    3       

     But the first people who were like ourselves lived so long ago that even their sagas, if they had any, are

forgotten.   4      

     Fortunately, however, ancient men made tools of stone, because this is easier to shape than other kinds. 

  5   Stone does not decay, and so the tools of long ago have remained when even the bones of the men who

made them have disappeared without trace.

A. They may also have used wood and skins, but these have rotted away.

B. descriptions of what important events happened in ancient times.

C. But there are some parts of the world where even now people can't write.

D. legends handed down from one generation of story-tellers to another.

E. So scientists have neither history nor legends to help them to find out where the first "modern men"

    came from.

F. But there is some doubt who began to write.

G. The sagas of these people explain that some of them came from Indonesia about 2,000 years ago.