— New York is so crowded and the pollution is so bad. 

— You know, ___________. I'm going to quit my job and move to the country. 

A．I've had enough

B．I like it here

C．It’ll be OK

D．It’s not as bad as all that

下列几种手术，需在术前预防性应用抗生素的是（）

A.全髋关节置换术

B.静脉曲张高位结扎术

C.输卵管结扎术

D.乳腺囊肿切除术

E.甲状腺切除手术