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單項選擇題

MIST is caused by（）.

A.forest fires
B.smoke from industrial areas
C.dust or sand storms
D.water droplets with the relative humidity more than 95%

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單項選擇題

In the Southern Hemisphere winds in a low pressure system rotate in a（）.

A.clockwise direction
B.northeasterly direction
C.northerly direction
D.counterclockwise direction

單項選擇題

In the relatively calm area near the hurricane center，the seas are（）.

A.moderate but easily navigated
B.calm
C.mountainous and confused
D.mountainous but fairly regular as far as direction is concerned