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【单选题】
船舶在进行明火作业时,其长期封闭的舱室或空间狭小通道作业前,必须通风,含氧量A.
（ ）以上
B.
15%
C.
16%
D.
18%
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举一反三
【单选题】It is usually not quite cold in this area in March, but sometimes temperature __________be very low.
A.
should
B.
can
C.
must
D.
shall
【简答题】A．They get cured sometimes. B．They become very sad. C．Sometimes they can return to their normal life. D．All of them can live for a long time after treatment.
【单选题】Looking after very young children _____ be very annoying sometimes, but you’ll get used to it after a while.
A.
must
B.
should
C.
shall
D.
can
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