--- Don’t look down upon Bob. He has his own advantages.

--- Oh, yes. ____ others are weak , he is strong.

A．When

B．Where

C．While

D．If

被视为癌前病变的是

A．乳腺炎

B．乳腺小叶增生

C．纤维囊性乳腺病

D．乳汁储留囊肿

E．大导管内 * * 状瘤