单项选择题
Seasickness is caused by rolling or rocking motions which affect fluids in the（）.
A.stomach B.lower intestines C.inner ear D.bladder
单项选择题 Releasing oil from the sea anchor of a lifeboat may（）.
单项选择题 On a vessel，if someone fell overboard and you did not know over which side the person fell，you should（）.
单项选择题 On a ship，a fire pump may be used for other purposes if（）.
