单项选择题

Niagara Falls is a great tourist _____drawing millions of visitors every year.

A．attention
B．attraction
C．appointment
D．arrangement
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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
单项选择题
The pressure _____causes American to be energetic, but it also puts them trader a constant emotional strain.
A．to compete
B．competing
C．to be competed
D．having competed
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