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
Artificial rainmaking has been most successful in the ______.
A．lake area
B．western slope of mountains
C．prairie lands
D．windward side of mountains
单项选择题
The observation of weather conditions by satellites is advantageous because it ______.
A．enables man to alter the weather
B．makes weather prediction easier
C．gives the scientific information not obtained readily otherwise
D．uses electronic instruments
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