单项选择题
In the Northern Hemisphere，gusty winds shifting clockwise，a rapid drop in temperature，thunderstorms or rain squalls in summer (frequent rain/snow squalls in winter) then a rise in pressure followed by clearing skies，indicate the passage of a(n)（） .
A.warm front
B.tropical cyclone
C.anticyclone
D.cold front
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相关考题
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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 -
单项选择题
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 -
单项选择题
In a microbarograph，the pen should be checked and the ink well filled（）.
A.each time the chart is changed
B.once per month
C.once per week
D.daily
