—_______ boys are there in your classroom? —23
A:What
B:Where
C:How many
大量捕捉青蛙,导致稻田里害虫大量繁殖,水稻减产,生态平衡失调.其原因是破坏了生态系统的 ( )
—We'd better eat up the rest as soon as possible.
____使得唐朝元气大伤,由盛转衰。