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

What does the passage say about asteroids and meteoroids（）

A．They are heavenly bodies similar in nature.
B．There are more asteroids than meteoroids.
C．They are heavenly bodies different in composition.
D．Asteroids are more mysterious than meteoroids.