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單項選擇題

What is the distance from the bottom of a wave trough to the top of a wave crest?（）

A.Wave length
B.Wave height
C.Wave breadth
D.wave depth

單項選擇題

Depths in the routes (Malacca and Singapore Straits) vary between 20m and about 23m but there are many areas of sand waves and depths are liable to change. The statement infers that（）.

A.depths in Malacca and Singapore Straits are stable
B.depths in Malacca and Singapore Straits are changeable
C.depths in Malacca and Singapore Straits are invariable
D.depths in Malacca and Singapore Straits are the same all the time