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

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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

單項選擇題

The horse latitudes are characterized by（）.

A.weak pressure gradients and light，variable winds
B.the formation of typhoons or hurricanes in certain seasons
C.steady winds in one direction for six months followed by wind reversal for the next six months
D.steady winds generally from the southeast in the Southern Hemisphere