— You ________ a child. You can take care of yourself.

— Really? But I am only 15 years old. [ ]

A. no longer are  

B. not any more are

C. are no longer  

D. no more are

鼠害的危害阈值是指（）的费用与鼠造成危害的损失相等时的鼠密度。

A.购买药品

B.防治鼠害

C.物理防治

D.化学防治