题目内容

Precipitation creates a _______ motion in the surrounding air.

A. upward
B. downward
C. forward
D. backward

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______ thunderstorms generally form in a warm, moist airmass and are associated with or scattered over a large area.

A. frontal
B. convection
C. airmass
D. cumulus

Airmass thunderstorms are most common during ________ .

A. hot summer afternoon
B. cold winter afternoon
C. warm spring afternoon
D. cool autumn afternoon

_______ thunderstorms can occur in late spring and summer during the late night or early morning.

Airmass
B. Frontal
C. Nocturnal
Daytime

Which one is not a hazard produced by thunderstorm?

A. lightning
B. turbulence
C. tornado
D. CAT

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