单项选择题
There is plenty of（）at this area.
A.A room B.Room C.Rooms D.The room
单项选择题 The primary reason for placing covers over storage batteries is to（）.
单项选择题 The master should（）necessary precautions to prevent accidents or damage.
单项选择题 The injured stevedore paid（）attention to the loading instructions from the chief Officer.
