单项选择题

There is something wrong with our radar．All kinds of objects can’t be clearly（）within the definite range.

A.Shown
B.Expressed
C.Appeared
D.Displayed

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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（）.

A.Prevent the accumulation of explosive gases
B.Protect the hull from leaking electrolyte
C.Prevent movement of the battery in rough waters
D.Protect against accidental shorting across terminals

单项选择题

The master should（）necessary precautions to prevent accidents or damage.

A.do
B.take
C.set
D.have