单项选择题

When you become frightened, many physical changes occur within your body. Your heartbeat and responses quicken; your pupils dilate (扩大) and () more light.

A. permit
B. allow
C. admit
D. let

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His ears are highly sensitive()any unusual sound in the machine.

A. of
B. on
C. to
D. by
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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