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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单项选择题
Sometimes the student may be asked to write about his ______ to a certain book or article that has some bearing on the subject being studied.
A．comment
B．reaction
C．impression
D．comprehension
单项选择题
Harry was ______ by a bee when he was collecting the honey.
A．stung
B．stuck
C．bitten
D．scratched
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