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單項(xiàng)選擇題

Modern ships are navigated by（）（衛(wèi)星）.

A.moon
B.satellite
C.sextant
D.radar

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單項(xiàng)選擇題

Their task is to（）（駕駛） the ship safely.

A.navigate
B.operate
C.takeover
D.drive

單項(xiàng)選擇題

Keep the vessel to the （）(中間)of the channel.

A.port
B.middle
C.head
D.front

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