單項(xiàng)選擇題

A deadhead is a(n)（）.

A.tree or log awash in a nearly vertical position
B.crew member who refuses to work
C.upstream end of a land wall
D.buoy that is adrift

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單項(xiàng)選擇題

A barometer showing falling pressure indicates the approach of a（）.

A.high pressure system
B.low pressure system
C.high dew point
D.low dew point

單項(xiàng)選擇題

（）the canal transit，the radar was operating.

A.At
B.In
C.During
D.With