题目内容

Thunderstorms produce some of the most dangerous weather elements in aviation, and you should avoid _______ them.

A. to penetrate
B. penetrating
C. penetrated
D. penetration

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Which of the following elements is not a condition necessary to create a thunderstorm?

A. unstable air
B. lifting action
C. strong wind
D. high moisture

The other weather phenomena may prevent you ______ the characteristics of thunderstorm.

A. to see
B. see
C. saw
D. from seeing

Lifting actions may be provided by several factors except _____?

A. rising terrain
B. fronts
C. convection
D. crosswind

Thunderstorms progress three definite stages which do not include _____?

A. cumulus
B. convection
C. mature
D. dissipating