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單項(xiàng)選擇題

（）is a high layer of cloud in the front of small flakes or cauhflower,white in colour with no dark shadows in between.

A.Cirrostratus
B.Cirrus
C.Cirrocumulus
D.Altostratus

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單項(xiàng)選擇題

（）is a silvery cloud in the front of feathers or fibres seen high up against a blue sky.

A.Cirrostratus
B.Cirrus
C.Cirrocmulus
D.Altostratus

單項(xiàng)選擇題

（）are mainly caused by the gravitational pull of the moon.

A.Tides
B.Sea
C.Swell
D.Wind