单项选择题
Steering a motor lifeboat broadside to the sea could cause it to（）.
A.capsize B.run smoother C.run faster D.sink
单项选择题 Severe exposure to chlorine gas can be fatal. Chlorine gas is primarily a（）.
单项选择题 Separation cloths may be used to（）.
单项选择题 Seasickness is caused by rolling or rocking motions which affect fluids in the（）.
