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．moans
B．pains
C．attempts
D．endeavours
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单项选择题
Most nurses are women, but in the higher ranks of the medical profession women are in a______.
A．scarcity
B．miniature
C．shortage
D．minority
单项选择题
It is______ in the act that no pension can be paid to anyone under the age of sixty unless he is disable.
A．laid off
B．laid aside
C．laid down
D．laid out
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