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
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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
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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