— I probably shouldn't have any more cake.

— Oh, ______.  It won't kill you.[ ]

A. go ahead                                          

B. hold on, please

C. you're welcome                                

D. that'll do

抖法操作时要求（）

A.幅度要大

B.频率要快

C.频率要慢

D.幅度要小

E.动作连贯