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單項(xiàng)選擇題

High clouds，composed of small white flakes or scaly globular masses，and often banded together to form a mackerel sky，would be classified as（）.

A.cirrus
B.cirrocumulus
C.altostratus
D.cumulonimbus

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單項(xiàng)選擇題

Good weather is usually associated with a region of（）.

A.low barometric pressure
B.high barometric pressure
C.falling barometric pressure
D.pumping barometric pressure

單項(xiàng)選擇題

Generally speaking，with（）the weather becomes cloudy or overcast with strong winds.

A.high pressures
B.low pressures
C.weak pressures
D.strong pressures

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