单项选择题

A person's calorie requirements vary______his life.

A．across
B．throughout
C．over
D．within
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单项选择题
The returns in the short______may be small, but over a number of years the in vestment will be well repaid.
A．interval
B．range
C．span
D．term
单项选择题
We had to______a lot of noise when the children were at home.
A．go in for
B．hold on to
C．put up with
D．keep pace with
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