At times the balance in nature is ______,resulting in a number of possibly unforeseen effects.
#20601
A
troubled
B
confused
C
disturbed
D
puzzled
推荐题目
. There were no tickets _____ for Friday’s performance.
#19935
A
preferable
B
possible
C
considerable
D
available
--- Do you think it _____ to argue with them?  --- The question is not worthy _____.
#18608
A
worthwhile; discussing
B
worthwhile; to be discussed
C
worthy; to discuss
D
worth; to be discussed