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问题 单项选择题

一张票面为50元的人民币，残缺部分为整个票面的2/5，其余部分的图案、文字能照原样连接，此张人民币可以兑换（）元人民币。

A.50

B.20

C.25

D.不能兑换

答案

参考答案：C

选择题

当前，在食品生产经营中违法添加非食用物质和滥用食品添加剂已成为影响中国食品安全的突出问题。如一些不法生猪饲养户为使商品猪多长瘦肉，在饲料中非法添加“瘦肉精”(化学式为C12H18Cl2N2O)，对消费者身体造成了极大危害。下列有关说法中确的是[ ]

A．“瘦肉精”是由有机物C12H18，单质Cl2和氧化物N2O组成的混合物

B．“瘦肉精”由五种元素组成

C．“瘦肉精”由35个原子构成

D．“瘦肉精”中碳元素和氢元素的质量比为2:3
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填空题

根据句意，用括号中所给词的正确形式填空。

1. Mr King learned Chinese as his _________ (two) language.

2. If you do your homework _________ (care), you will lose the exam again.

3. We should think about what we can do _________ (keep) animals and plants from becoming endangered.

4. —Did you go to Tom's birthday party? —No, I _________ (not invite)

5. We should do something to stop sandstorms from _________ (happen)

6. The man has known a lot of Chinese since he _________ (come) to China three years ago.

7. They _________ (not go) to the market until they finish their work.

8. The policeman said that he _________ (see) a Young Pioneer help an old woman cross the road

    the day before.

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