单项选择题

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

A．disturbed
B．distributed
C．displayed
D．discovered
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单项选择题
Volumes have been written on the purpose of education in the United States and the subject continues to be one of active ___________ and discussion.
A．conclusion
B．concern
C．competition
D．coordination
单项选择题
After the discussion it becomes clear that his theory is based on a false ___________.
A．consideration
B．composition
C．supposition
D．acquisition
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