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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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
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
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