单项选择题

Intention movements are activities that tend to ______ some other activities, which is presumably why they often evolve into signals.

A．precede
B．process
C．proceed
D．propose
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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
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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