单项选择题

At the present time, experiments are being conducted in ______.

A．30-day" outlooks"
B．predicting storms
C．controlling weather
D．determining density of pressure groups
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单项选择题
The word gains in the second sentence in the last paragraph means ______.
A．increases
B．progresses
C．profits
D．things
单项选择题
The 30-day forecast is determined by examining ______.
A．daily weather maps
B．upper air levels
C．satellite reports
D．changing fronts
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