单项选择题

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

A．manipulating weather
B．determining density of pressure groups
C．30-day "outlooks"
D．controlling storms
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单项选择题
The observation of weather conditions by satellites is advantageous be cause it ______.
A．uses electronic instruments
B．enables man to alter the weather
C．makes weather prediction easier
D．gives the scientist information not obtained readily otherwise
单项选择题
The thirty-day forecast is determined by examining ______.
A．daily weather maps
B．upper air levels
C．satellite reports
D．changing fronts
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