问题 解答题

我国东北、内蒙和新疆部分地区虽处同一纬度带,但东北是森林群落,内蒙是草原群落,而新疆则主要是荒漠群落,其主要原因是______.

答案

水影响植物的分布主要是因为:第一水是构成植物体的主要成分.第二水是植物进行各种生理活动的必需的物质,如化学反应的溶剂、物质的运输、光合作用的原料等.由于各种植物对水的要求不同,所以就影响了植物的分布.我国东北、内蒙和新疆的部分地区处于同一纬度带,气温相近;植被类型却不同是因为从东到西,降水逐渐减少;东北降水多,内蒙降水较少,新疆的部分地区降水很少.在东北有足够的水供给植物生长,所以东北能够生长茂密的森林,而内蒙的降水量相对较少,只能够形成草原植被;新疆的部分地区降水很少,植被很少,形成荒漠.因此东北地区主要是森林,内蒙主要是草原,而新疆则是荒漠,植被不同的主要原因是降水量不同.可见D符合题意.

故答案为:降水量不同

阅读理解

阅读理解。

     See Lin has an interesting hobby. She collects stamps (邮票). She spends(花费) a lot of time on

her stamp collection after school. She collects (收集) hundreds of stamps from all over the world. They

are all in colours.

     See Lin likes stamps with pictures of animals and birds on them. In this way, she learns the names

of many animals and birds. She also borrows books about animals and birds from her school library.

She learns many things about them.

    Sometimes See Lin has many stamps of the same kind. She gives them to her friends. They then give

her other stamps in return (作为回报). See Lin writes letters to her friends in other countries (国家).

She sends them stamps of her country. In return, they send her stamps of their countries. See Lin's father

also gives her stamps. He brings them home from his office for her.

     Many of See Lin's friends collect other things. Some collect photos and others collect match (火柴)

boxes. But, all of them say that See Lin's collection is the most interesting of all.

1. See Lin spends a lot of time on her stamp collection ________.

A. before school      

B. in class    

C. after school    

D. at midnight

2. All of See Lin's stamps are ________.  

A. from other countries  

B. the same    

C. old but nice    

D. colourful

3. See Lin learns a lot about ________ from her stamps.

A. film stars          

B. plants and flowers    

C. animals and birds  

D. sports and games

4. When See Lin has many stamps of the same kind, she _________. 

A. cuts them                      

B. decorates books with them   

C. gives them to her father          

D. sends them to her friends

5. Which of the following is TRUE according to the passage?

A. See Lin doesn't have any friends in other countries.

B. All of See Lin's friends like collecting stamps.

C. See Lin's father doesn't have a job, he stays at home every day.

D. There is a library in See Lin's school.

判断题