However,at times this balance in nature is__,resulting in anumber of possibly unforeseen effects.
A. troubled
B. disturbed
C. confused
D. puzzled
网友回答
A. troubled
(答案→)B. disturbed
C. confused
D. puzzled
解析:从句子的后半部分的result in effects可知balance in nature受到了破坏。Disturb符合句义。