单项选择题
An anemometer on a moving vessel measures（）.
A.apparent wind speed only B.true wind speed and true wind direction C.true wind speed only D.apparent wind speed and true wind direction
单项选择题 Altocumulus clouds are defined as（）.
单项选择题 Above-normal tides near the center of a hurricane maybe caused by the（）.
单项选择题 A very light breeze that causes ripples on a small area of still water is a（）.
