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單項選擇題

The place where a channel moves from along one bank of the river over to the other bank of the river is called a（）.

A.draft
B.cutoff
C.draw
D.crossing

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單項選擇題

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

單項選擇題

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