单项选择题
In the Northern Hemisphere，an area of counterclockwise wind circulation surrounded by higher pressure is a（）.
A.low
B.high
C.warm front
D.cold front
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In many areas atoll clouds (clouds of vertical development) are produced over small islands. These are the result of（）.
A.rising air currents produced by the warm islands
B.warm air from the sea rising over higher land areas
C.cool land air mixing with warm sea air
D.descending air over the islands -
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A.each time the chart is changed
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If an observer in the Northern Hemisphere faces the surface wind，the center of low pressure is to his（）.
A.left，slightly behind him
B.right，slightly behind him
C.left，slightly in front of him
D.right，slightly in front of him
