单项选择题

There were many people present and he appeared only for a few seconds, so I only caught a ______ of him.

A．glance
B．glimpse
C．look
D．sight
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单项选择题
A thorough study of biology requires ______ with the properties of trees and plants, and the habit of birds and beasts.
A．acquisition
B．discrimination
C．curiosity
D．familiarity
单项选择题
However, at times this balance in nature is ______, resulting in a number of possibly unforeseen effects.
A．troubled
B．disturbed
C．confused
D．puzzled
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