A:男性
B:女性
C:可能是男性也可能是女性
D:要等出生后才能确定
— Excuse me. Can you tell me where the nearest bank is?
— ________ Oh, yes! It's past the post office, next to a big market.
做生物组织中蛋白质的鉴定实验,最好选用下列哪种实验材料