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问题 选择题

下列四个选项中，属于生态系统的是（　　）

A．一片森林

B．一群麻雀

C．一条鱼

D．一排柳树

答案

生态系统就是在一定的地域内，生物与环境构成的统一的整体．生物与环境是不可分割的，只有生物不叫生态系统，只有环境也不叫生态系统．

A、一片树林，即包括了树林所在的环境，又包括了此环境中的所有生物，是一个完整的生态系统，符合题意．

B、一群麻雀只是部分生物，没有环境，不能构成一个完整的生态系统．不符合题意．

C、一条鱼只是部分生物，没有环境，不能构成一个完整的生态系统．不符合题意．

D、一排柳树只包括了生物部分的部分植物，没有其它生物，也没有环境部分，不能构成一个完整的生态系统，，不符合题意．

故选：A

阅读理解

阅读理解。

     People drink tea in a lot of countries in the world. But tea doesn't mean the same thing to everyone. In

  different countries, people have very different ideas about drinking tea.

     In China, people always drink tea when they are getting together. The Chinese drink it at any time of

 the day at home or in teahouses. They prefer plain tea, with nothing else in it.

     Another tea-drinking country is England. In England, the late afternoon is "tea time". Almost everyone

 has a cup of tea then. The English usually make tea in a teapot and drink it with milk and sugar. They also

  eat cakes and cookies at tea time. This is so-called "afternoon tea" in England.

     In America, people drink tea mostly for breakfast or after meals. Americans usually use tea bags to

  make tea. In summer, many Americans drink cold tea-"iced tea". Sometimes they drink iced tea from

  cans (金属罐).

1. The Chinese like drinking tea ____.

    A. alone    

    B. only in the afternoon  

    C. when people get together  

    D. with sugar in it

2. In England tea time is ____.

    A. during breakfast  

    B. between meals  

    C. the late afternoon        

    D. the early morning

3. The underlined phrase "plain tea " means ____.

    A. 可乐茶        

    B. 冰茶        

    C. 苏打茶                

    D. 清茶
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名词解释

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