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