单项选择题
（）should be saved first in an accident.
A. The ship B. The cargo on board C. The persons on board D. The bridge
单项选择题 The emergency alarm is sounded on （）according to master’s order.
单项选择题 The life-jacket is usually put （）in your cabin.
单项选择题 There is a smell of gas in the hold. You must wear your （）.
