胃镜检查常见的并发症有（）
A.低氧血症
B.肿瘤转移
C.术后腹泻
D.心跳骤停
E.食管、胃肠穿孔
参考答案：A, D, E
在读8020007300时，共要读出几个零？[ ]
A．1
B．3
C．0
In the following two hours he was _____ the performance, because it turned out to be as wonderful as he had
expected. [ ]
A. tired of
B. absorbed in
C. annoyed with
D. concerned about
