單項選擇題Weather conditions in the middle latitudes generally move().

A.Eastward
B.Westward
C.Northward
D.Southward


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2.單項選擇題The eye of a hurricane is surrounded by dense black cumulonimbus clouds which are called the().

A.Wall cloud
B.Nimbostratus cloud
C.Bar
D.Funnel

3.單項選擇題The dense black cumulonimbus clouds surrounding the eye of a hurricane are called().

A.Spiral rainbands
B.Cloud walls
C.Funnel clouds
D.Cyclonic spirals

4.單項選擇題The Beaufort scale is used to estimate the().

A.Wind direction
B.Percentage of cloud cover
C.Wind speed
D.Barometric pressure

5.單項選擇題The area of strong westerly winds occurring between 40°S and 60°S latitude is called the().

A.polar easterlies
B.prevailing westerlies
C.roaring forties
D.jet streams