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