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
William Penn, the founder of Pennsylvania, ______ defended the right of every citizen to freedom of choice in religion.
A．peculiarly
B．indifferently
C．vigorously
D．inevitably
单项选择题
The speech which he made______ the project has bothered me greatly.
A．being concerned
B．concerned
C．be concerned
D．concerning
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