问题 选择题

2008年9月,中国爆发三鹿婴幼儿奶粉受污染事件,导致食用了受污染奶粉的婴幼儿产生肾结石病症,其原因是奶粉中含有三聚氰胺。下列关于三聚氰胺(结构如图)的叙述错误的是

A.三聚氰胺的分子式为C3N6H6

B.呈弱碱性,与盐酸反应能形成三聚氰胺盐

C.三聚氰胺易溶于水,也易溶于乙醇

D.奶粉中加入三聚氰胺能提高牛奶中氮的含量

答案

答案:C

阅读理解

阅读理解。

      

     Have you ever thought about keeping a pet goldfish? First you need to know how to keep it.     

     Get a fishbowl      

     First get a fishbowl. Make sure the fishbowl is large enough for the goldfish to swim in. You should

 keep the fishbowl clean. Don' t clean the fishbowl with soap. Hot water will clean it well.     

     Feed a goldfish       

     Goldfish eats almost any food. And you can also buy some special food for your goldfish in shops. Do

 not feed it too much food. Feed it as much as it can eat in three minutes one time.      

     Keep the water clean     

     Dirty water is not good for the health of the goldfish. If the water is dirty, the goldfish will easily 'get 

 sick and may die. Change 25% of the water at least once a week. Never change all of the water because 

 it includes something that your goldfish needs.      

     As you can see, keeping goldfish as pets is  not difficult.

1. When you choose a fishbowl, you should think about the _____ of it.

    A. size                  

    B. color

    C. shape                  

    D. height

2. What's the meaning of the underlined word "die"?

    A. 康复                    

    B. 长大

    C. 厌恶                      

    D. 死亡

 3. You can't _____ according to the  passage.

    A. feed the goldfish some special food

    B. give it as much food as possible one time

    C. use hot water to clean the fishbowl

    D. change part of the water on time

4. Which of the following points is NOT mentioned in the passage?

    A. Getting a fishbowl.

    B. Feeding a goldfish.

    C. Choosing a goldfish.

    D. Keeping the water clean.

5. The writer thinks that it is _____ to keep a goldfish.

    A. cheap                  

    B. easy

    C. expensive            

    D. difficult

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