单项选择题

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

A．reaction
B．reflection
C．response
D．revelation
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单项选择题
One reason for the successes of Asian immigrants in the U.S. is that they have taken great to educate their children.
A．pains
B．endeavors
C．attempts
D．efforts
单项选择题
They are studying whether the project of landing a manned disc on the Mars is ___________.
A．probable
B．feasible
C．reliable
D．available
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