单项选择题

Cumulonimbus clouds are formed by（）.

A.vertical air movements
B.heavy rainstorms
C.horizontal air movements
D.any movement of moist air

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单项选择题

A.Skull and crossbones
B.Yellow and white
C.Red and white
D.White and black

单项选择题

A.soft clay
B.hard mud
C.very soft mud
D.sand

单项选择题

A.immediately after restoring vital services
B.immediately
C.following control of flooding
D.following establishment of fire boundaries