单项选择题

My sister is quite ______ and plans to get a Ph. D. in the future.

A．aggressive
B．ambitious
C．considerate
D．enthusiastic
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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
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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