AFP的测定对下列哪些肿瘤有辅助诊断价值()
A.精原细胞瘤
B.肝细胞肝癌
C.内胚窦癌
D.肝样胃癌
E.胚胎性癌
参考答案:A, B, C, D, E
My parents live in a small village. They always keep candles in the house ___ there is a power cut.
A.if
B.unless
C.in case
D.so that