單項(xiàng)選擇題There is a drifting mine()in position 21 degrees 31 minutes North 124 degrees 20 minutes East.

A.report
B.reports
C.reported
D.reporting


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1.單項(xiàng)選擇題There is a()mine in position 50°N,30°W.

A.drifting
B.drifted
C.drift
D.draft

2.單項(xiàng)選擇題The weather is often()in a high-pressure area.

A.fine
B.cloudy
C.rainy
D.windy

3.單項(xiàng)選擇題The space in Hatch No.4 tweendeck is too().

A.near
B.short
C.close
D.small

5.單項(xiàng)選擇題The height of a VHF radio antenna is more important than the power output wattage of the radio because().

A.VHF communications are basically line of sight
B.the air is more dense the higher you go
C.salt water is a poor conductor of sound
D.sea water absorbs the radiated energy