单项选择题

You should keep it in the icebox,（） it will go bad.

A. and
B. or
C. but
D. so

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单项选择题
So little （） about mathematics that the lecture was completely beyond me.

A. I know
B. I knew
C. did I know
D. do I know
单项选择题
Water, when boiled, always （）steam.

A. gives in
B. gives up
C. gives off
D. gives away
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