单项选择题
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
单项选择题 The largest waves (heaviest chop) will usually develop where the wind blows（）.
单项选择题 The horse latitudes are characterized by（）.
单项选择题 The height of a wave is the vertical distance（）.
