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
Tony is very disappointed______ the results of the exam.
A．with
B．for
C．toward
D．on
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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