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
However, at times this balance in nature is______ resulting in a number of possibly unforeseen effects.
A．bewildered
B．disturbed
C．mystified
D．perplexed
单项选择题
In such a changing and complex society,______ simple solutions to informational needs become complicated now.
A．formally
B．formerly
C．frequently
D．fundamentally
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