—You will break down if you keep on doing like that.

—______, but I just want a good result in this exam. [ ]

A. Thanks a lot                

B. Don’t mention it

C. You’re welcome            

D. Sounds great

急救复苏时心外按压次数与人工呼吸次数比（）

A.15：2

B.15：1

C.5：1

D.5：2

E.12：1