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
A person's calorie requirements vary______his life.
A．across
B．throughout
C．over
D．within
单项选择题
The returns in the short______may be small, but over a number of years the in vestment will be well repaid.
A．interval
B．range
C．span
D．term
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