-Look! A book is on the floor. Whose is it? -It be Rick's. It has his name on it. A. mustn't B. can't C. must D. need 题目和参考答案——青夏教育精英家教网—

题目内容

—Look! A book is on the floor. Whose is it?

—It ______be Rick's. It has his name on it.

A. mustn't B. can't C. must D. need

C【解析】考查情态动词的用法。mustn’t“禁止；不要”；can’t“不可能”；must“一定”；need“必要”。由下文句意“在上面有他的名字”可知，这本书一定是里克的。故选C。

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A: _ B: I'm sorry. I'll do it now.

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We live in the computer age. People use computers to do much of their work. But few people know how to look after them. Remember the following when you use your computer:
1.Keep your computer in a cool, dry room. Too much or too little heat is bad for computers. Damp(潮湿) is also bad for them.
2.Do not let people smoke near your computer. Smoke of all kinds is very bad for many parts of a computer.
3.Do not eat or drink when you are near your computer. Pieces of food and a little water in the keyboard are also bad for a computer.
4.Keep your screen clean and do not have it too bright. They are bad for your eyes. Make sure the screen is not too far from or too near your eyes. Some people use different glasses to protect their eyes when they use a computer.
【小题1】Computers can people to do a lot of work.

【小题2】Few people know how to their computers.

【小题3】A computer works well at a temperature of .

A．0℃

B．-5℃