单项选择题

However, at times this balance in nature is _________, resulting in a number of possibly unforeseen effects.

A．confused
B．disturbed
C．troubled
D．puzzled
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单项选择题
The development history of the society tells us that man has _________ from the ape.
A．revolved
B．evolved
C．involved
D．dissolved
单项选择题
The famous artist is thinking of _________his paintings in the art gallery.
A．displaying
B．demonstrating
C．exhibiting
D．exemplifying
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