问题
选择题
At times the balance in nature is ________， resulting in a number of possibly unforeseen effects.[ ]
A．troubled
B．confused
C．disturbed
D．puzzled
答案
答案：C
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At times the balance in nature is ________， resulting in a number of possibly unforeseen effects.[ ]
A．troubled
B．confused
C．disturbed
D．puzzled
答案：C