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單項選擇題

The depth over a shallow patch，（）about 1．5 miles southeastward of Nanshan Tou lighthouse，reduces to 8 meters.

A.lay
B.lies
C.being lain
D.lying

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The danger associated with using carbon dioxide in an enclosed space is（）.

A.frostbite
B.skin burns
C.asphyxiation
D.an explosive reaction

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The bottom row of plating next to the keel of a lifeboat is known as the（）.

A.sheer strake
B.bilge strake
C.garboard strake
D.keel rib