单项选择题

The young men's balloon flew because the air in it was ______.

A．hot
B．heavy
C．cold
D．fine
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单项选择题
The people were happy because ______.
A．there was a lot of food
B．it was dangerous
C．the balloon was in the air
D．they were hot
单项选择题
The two men threw everything out of their balloon because ______.
A．the balloon went up
B．the balloon went down
C．it was cold
D．it was exciting
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