单项选择题

What would be ideal weather for flying a balloon

A．A hot day with no wind.
B．A cold, very windy day.
C．A clear day with a little wind.
D．A warm, rainy day.
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填空题
the sun.
单项选择题
After his accomplishment, Schaefer ______.
A．retired from work
B．lost his interest in rainmaking
C．handed over the work to his student
D．performed his experiment again and again
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