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【判断题】
StringBuffer类是线的，StringBuilder类是线程不安全的。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】When the passenger woke up, he ______ (发现自己躺在医院的病房里).
【单选题】Samuel survived when the car ______ he was a passenger in turned off the road and hit a tree. [ ]
A.
where
B.
that
C.
as
D.
why
【简答题】When the passenger woke up,______.(他发现自己躺在医院的病房里).
【多选题】When a passenger smoking in the station, what should we do as station officers?
A.
a station officer should go up and put off the cigarette immediately .
B.
a station officer should stop the passenger and ask him to put off the cigarette immediately.
C.
a station officer should tell the passenger to care for maintaining the public health.
D.
a station officer should tell the passenger to go away straightly.
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