单项选择题

It is required that such insulator (绝热体) () a heat resistant material.

A. must be made of
B. should be made of
C. will be made of
D. would be made of

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单项选择题

If a metal bar is heated, the greater the heat (), the larger the expansion.

A. applied
B. being applied
C. applying
D. is applied

单项选择题

Speaker A: Would you like to see those pants in another color They also come in brown and in navy. Speaker B: Actually the gray is fine but I prefer something in wool. Speaker A: ______.

A. Yes, I do. Here you are
B. OK. Wait a moment. I’m sure I can find what you prefer
C. Yes. But I have no time
D. Sorry, I’m afraid you cannot find anything you like

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