单项选择题

One reason for the success of Asian immigrants in the U.S. is that they have taken great ______ to educate their children.

A．efforts
B．pains
C．attempts
D．endeavors
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单项选择题
As intriguing as these results are, much remains unclear about the impact of low doses of a low doses of alcohol ______ system.
A．immune
B．vulnerable
C．chronic
D．susceptible
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It is hoped that the prisoner will be released through the ______ of the president himself.
A．intrusion
B．interruption
C．intervention
D．interference
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