Church as we use the word refers to all religious institutions,_____they Christian,Islamic,Budd-
hist,Jewish,and so on.
A. be B. being C. were D. are
However, at times this balance in nature is ( ), resulting in a number of possibly unforeseen effects.
A troubled B confused C disturbed D puzzled
分析：本题大意：然而，自然界中的这种平衡时常被打乱，导致大量未被预见的结果。
Troubled：打扰，麻烦；Confused：搞糊涂；
Disturbed：打乱，打扰，骚扰；
Puzzled：使人迷惑。