问题 解答题

如图是某生态系统中的食物网,请据图回答.

(1)从生态系统的成分来看,图中的绿色植物属于______,各种动物属于______,而未显示在图中的细菌和真菌属于______.

(2)图中共有______条食物链,请写出其中最短的一条:______.

(3)若该生态系统受到DDT的污染,则______的体内DDT含量最高,原因是DDT会通过______不断积累.

(4)从图中可以看出,鹰体内的能量最终来源于______.

答案

(1)绿色植物在有光的条件下,通过光合作用制造储藏能量的有机物,是生态系统的生产者;各种动物直接或间接以绿色植物为食,属于消费者;细菌、真菌能分解动植物遗体内的有机物,属于分解者.

(2)生态系统中消费者和生产者之间的营养联系就是食物链,食物链的始端是生产者,最凶猛的肉食性动物位于食物链的末端.图中共有5条食物链,分别是:绿色植物→兔→鹰,绿色植物→蚯蚓→相思鸟→鹰,绿色植物→蚱蜢→蚯蚓→相思鸟→鹰,绿色植物→蚱蜢→蜥蜴→蛇→鹰,绿色植物→相思鸟→鹰.

(3)鹰位于各条食物链的末端,若该生态系统受到DDT的污染,则鹰的体内DDT含量最高,原因是DDT会通过食物链不断积累.

(4)图中各种消费者体内的能量直接或间接来源于绿色植物,绿色植物体内的能量是通过光合作用固定的太阳能;这样,鹰体内能量的最终来源也是太阳能.

故答案为:

(1)生产者;消费者;分解者

(2)5;绿色植物→兔→鹰(绿色植物→相思鸟→鹰)

(3)鹰;食物链

(4)太阳能

多项选择题
阅读理解

阅读理解。

     We send our children to school to prepare them for the time when they will be big and will have to

 work for themselves. They learn their own language so that they will be able to tell others clearly what they

  want and what they know, and understand what others tell them. They learn foreign languages in order to

  be able to understand the people from other countries and make themselves understood. They learn

 history to know something about human beings they meet every day. What they learn at school is, of

 course, quite useful, but is that the only reason (原因) why they go to school?

     No. There is more in education than just learning facts. We go to school, above all, to learn how to

  learn, so that when we have left school, we can continue to learn. A man who really knows how to learn

  will always be successful, because whenever he has to do something new, he will quickly teach himself

 how to do it in the best way. The uneducated person, on the other hand, is either unable to do something

  new, or does it badly. So the purpose (目的) of school is not just to teach the students these useful

 subjects but teach the way to learn.

1. Children are sent to school because _____.

    A. they can grow fast at school

    B. they have to work for themselves at the moment

    C. the parents have to prepare them for their future

    D. they are able to learn facts

2. Why do they learn languages?Because they will _____.

    A. make friends with others

    B. be able to speak to and hear others clearly

    C. be able to understand others

    D. make themselves understood

3. The sentence"There is more in education than just learning facts"means _____.

    A. learning facts isn't the only thing in education

    B. there are more facts to learn in education

    C. education is just learning facts

    D. learning facts is more important in education

4. What does an educated person do when he meets something new? He will _____.

    A. try his best to do it

    B. quickly find the best way out

    C. be unable to do it well?

    D. know how to learn

5. The main idea of the text is that_____.

    A. children must go to school

    B. the subjects at school are useful

    C. parents should send their children to school

    D. children should be taught not only to learn but how to learn