—Would you mind if I use your telephone?

— ________. Help yourself.

A．Not at all

B．Certainly

C．No, I wouldn’t

D．OK

气滞心胸的胸痛特点是（）

A.胸部满闷，痛无定处

B.胸痛彻背，背痛彻心

C.胸部憋闷如窒，心悸汗出

D.胸部隐隐作痛

E.胸痛如刺，痛处不移