单项选择题
21（）
A．role
B．hand
C．action
D．effect
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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
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