— Catherine, I have cleaned the room for you.

— Thanks. You _____ it. I could manage it myself. [ ]

A. needn't do

B. needn't have done

C. mustn't do

D. shouldn't have done

过量食用后中毒症状先兴奋后抑制的是（）。

A.菜豆

B.荔枝

C.桑葚

D.银杏