问题 单项选择题

一个完整的生态系统的结构包括:()

A.食物链和食物网

B.生态系统的成分和生态系统的营养结构

C.生产者、消费者、分解者

D.生产者、消费者、分解者、无机环境

答案

参考答案:B

解析:

生态系统的结构包括生态系统的组成成分以及生态系统的营养结构,生态系统的组成成分包括非生物的物质和能量、生产者、消费者和分解者,生态系统的营养结构包括食物链和食物网。

考点:本题考查生态系统的结构。

点评:本题难度较小,属于考纲识记层次。解答本题的关键是理解生态系统结构的组成。

选择题
阅读理解

                            B

  What is language for? Some people seem to think it's for practicing grammar rules and learning lists of words—the longer the lists,the better. That's wrong. Language is for the exchange(交流)of ideas and information. It's meaningless knowing all about a language if you can't use it freely. Many students I have met know hundreds of grammar rules, but they can't speak correctly or fluently. They are afraid of making mistakes. One shouldn't be afraid of making mistakes when speaking a foreign language. Native speakers make mistakes and break rules, too. Bernard saw once wrote, "Foreigners often speak English too correctly." But the mistakes that native speakers make are different from those that Chinese students make. They're English mistakes in the English language. And if enough native speakers break a rule, it is no longer a rule. What used to be wrong becomes right. People not only make history, they make language. But a people can only make its own language. It can't make another people's language. So Chinese students of English should pay attention to grammar, but they shouldn't overdo(做过头)it. They should put communication first. 

小题1:Language is used to ________.

A. express oneself           B. practice grammar rules

B. talk with foreigners only    D. learn lists of words

小题2:Generally, when an American or an Englishman speaks English, he ________.

A.never makes mistakes  

B.often makes mistakes

C.can't avoid making mistakes

D.always makes mistakes小题3:"Foreigners often speak English too correctly. "This sentence means that ________.

A.foreigners speak correct English

B.foreigners speak incorrect English

C.foreigners speak English according to the grammar rules

D.foreigners never make mistakes when they speak English小题4:If too many native speakers break a rule, ________.

A.what they use will become right

B.they are against the law

C.they should say sorry to others

D.they will become heroes小题5:When we speak a foreign language, we should ________.

A.speak in Chinese way

B.speak by the rules

C.speak to native speakers

D.not be afraid of making mistakes