有关甲胎蛋白的说法下列哪项最正确()
A.原发性肝癌都高
B.慢性肝炎都不高
C.凡是肝脏恶性肿瘤都高
D.急性肝炎都不高
E.原发性肝癌多数增高
参考答案:E
The more one is ______ the English-speaking environment,the better he or she will learn the language.
A.exposed to
B.filled in
C.caught on
D.kept up
腹部平片可用于下列哪些疾病的检查()
A.胆囊结石
B.消化道穿孔
C.胃溃疡
D.肠结核
E.乙状结肠扭转