单项选择题
The direction of the southeast trade winds is a result of the（）.
A.equatorial current B.humidity C.rotation of the earth D.change of seasons
单项选择题 The currents are（）mosoonal origin．
单项选择题 The cold ocean current which meets the warm Gulf Stream between latitudes 40°and 43°N to form the cold wall is called the（）.
单项选择题 The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
