丙氨酸氨基转移酶增高者首先考虑是（）
A.心肌炎
B.肝硬化
C.肝癌
D.肝炎
E.胆结石
参考答案：D
— Sorry, the tickets have already been sold out.
— Really? Maybe I ________ a little earlier.[ ]
A. should come
B. should have come
C. could have come
D. must have come
下列哪些内容可以成为旅游吸引物（）
A.雪山
B.旅游服务
C.社会制度
D.大江大河
