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
正确答案：D
在北半球夏季阵风风向顺时针方向变化温度骤降雷暴雨或暴风骤雨（冬季频繁的雨雪交加）然后随着气压上升天空晴朗表明冷锋通过
