However, at times this balance in nature is ______, resulting in

However, at times this balance in nature is ______, resulting in a number of possibly unforeseen effects.
A、disturbed
B、troubled
C、confused
D、puzzled
【正确答案】：A
【题目解析】：本题考察易混词辨析，A项：干扰，搅乱；B项：麻烦； C项：使人迷惑； D项：迷惑；这句话的意思是：然而,有时自然平衡被打乱导致了大量可能无法预料的影响，A项符合题意。