单项选择题
Cirrocumulus belongs to（）.
A.low clouds B.High clouds C.Special clouds D.medium clouds
单项选择题 Altostratus belongs to（）.
单项选择题 （）is a high layer of cloud in the front of small flakes or cauhflower,white in colour with no dark shadows in between.
单项选择题 （）is a silvery cloud in the front of feathers or fibres seen high up against a blue sky.
