单项选择题

Clark felt that his ______ in one of the most dramatic medical experiments of all time was worth the suffering he underwent.

A．presentation
B．participation
C．apprehension
D．appreciation
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单项选择题
Scientists wilt have to ______ new methods of increasing the world's food supply in order to feed more hungry people.
A．catch up with
B．come up with
C．keep up with
D．put up with
单项选择题
The board has ______ some rules that every member of the club must follow.
A．taken down
B．set down
C．let down
D．laid down
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