联合检测可以提高原发性肝癌诊断率的肿瘤标志物()。
A.AFP
B.PAP
C.AFU
D.CEA
E.PSA
参考答案:A, B
--- Where is your grandpa now?
--- He ______ newspaper in the living room.
A.read
B.is reading
C.was reading
D.reads
藻类常含有()
A.碘、钾等无机元素
B.蛋白质
C.甾醇
D.氮基酸及其衍生物
E.多聚搪或搪醇、糖醛酸