— ___________ that boy?

— He's my brother.[ ]

A. Who

B. Who's

C. Who are

急性乳腺炎最常见于（）

A.妊娠期妇女

B.初产哺乳的妇女

C.哺乳半年后的妇女

D.长期哺乳的妇女

E. * * 凹陷的妇女