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單項(xiàng)選擇題

The best time to work a boat into a slip is（）.

A.when the wind is against you
B.with the current setting against you
C.at slack water
D.with a cross current

單項(xiàng)選擇題

The Benguela Current flows in a（）.

A.SW'ly direction along the NW coast of Africa
B.S'ly direction off the East Coast of Australia
C.NW'ly direction along the SW coast of Africa
D.SW'ly direction along the SE coast of Greenland

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