Clouds are classified into four families, based on their _______ .
A.characteristics and altitudes
B.shapes and altitudes
C.components and shapes
D.thicknesses and components
正确答案是A
Clouds are classified into four families, based on their _______ .
A.characteristics and altitudes
B.shapes and altitudes
C.components and shapes
D.thicknesses and components
正确答案是A