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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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
单项选择题
What color is the sky
A．It is blue.
B．It is white.
C．It is grey.
D．It has no color.
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