单项选择题

At what time of the day do most balloon flights take place

A．Only in the morning.
B．During the early afternoon.
C．In the early morning or the late afternoon.
D．In the early afternoon or late at night.
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单项选择题
Schaefer should have shut the freezer when he left for lunch because ______.
A．it was a rule
B．cold air is heavier than hot air
C．ice is solid
D．summer had arrived and the weather was warm
填空题
Indirectly.
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