At times the balance in nature is ______ , resulting in a number of possibly unforeseen effects. 
#84042
A
troubled
B
confused
C
disturbed
D
puzzled
推荐题目
 Iraq has ________ too many wars since 1990, making his people ________ a lot.
#64491
A
got through; pay
B
looked through; pain
C
gone through; suffer
D
passed through; damage
Don’t worry .The food _______us three days .
#83166
A
lasted
B
will last
C
remains
D
will keep