单项选择题

As you have seen, the value of a nation's currency is a ______ of its economy.

A．reaction
B．response
C．reflection
D．revelation
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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
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
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