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單項(xiàng)選擇題

The ocean bottom that extends from the shoreline out to an area where there is a marked change in slope to a greater depth is the（）.

A.abyssal plain
B.continental shelf
C.borderland
D.offshore terrace

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單項(xiàng)選擇題

The length of a wave is the length（）.

A.of the wave's crest
B.of the wave's trough
C.measured from crest to trough
D.measured from crest to crest

單項(xiàng)選擇題

The largest waves (heaviest chop) will usually develop where the wind blows（）.

A.at right angles to the flow of the current
B.against the flow of the current
C.in the same direction as the flow of the current
D.over slack water

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