用于检测抗ENA抗体的免疫印记技术属于（）

A.放射免疫技术

B.酶联免疫技术

C.膜载体酶免疫技术

D.对流免疫电泳技术

E.以上都不是

---- You’re coughing badly, Martin．Why not give up smoking?

---- Give up smoking? Easier said than done, Amy．Once you _____ the habit of smoking, it is very hard for you to______．

A．keep up; break it away

B．take up; drop it out

C．pick up; get rid of it

D．build up; do away with it