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
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
After age 40, people find it hard to get rewarding jobs because ______.
A．their abilities and physical strength start to become weak
B．the inherent characteristics of our value system makes it so
C．they don't want to be rejected
D．they have no courage to venture
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