挂失清户时客户本人应提供的（）办理清户手续。
A.有效身份证件
B.绿卡
C.挂失申请书和有效身份证件
D.挂失申请书
参考答案：C
If you eat this kind of plant, you ____ very sick. [ ]
A. are
B. were
C. will be
D. have been
天然气柜通风风机正常运行时常开，火灾保护跳闸时停运。（）
