对用户交寄的信件，必要时邮政企业可以要求用户开拆，进行验视，但不得检查信件内容。用户拒绝开拆的，邮政企业不予收寄。
参考答案：对
洗必泰作为口腔冲洗、含漱和黏膜创口消毒的浓度为（）
A.1%
B.0.2%
C.0.5%
D.0.1%
E.0.3%
It is easy for people to ______ the bad habits such as smoking and drinking, which are not so easy
to get rid of. [ ]
A. look into
B. slide into
C. break into
D. knock into
