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
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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
单项选择题
The reform in economic system will help______ and develop the socialist economic base.
A．consolidate
B．enhance
C．elevate
D．prolong
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