单项选择题

Scientists had thought the "explosion" was caused by ______.

A．a meteor
B．a small comet
C．an spaceship from another planet
D．some big fire
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单项选择题
The meaning of the word ignite is ______.
A．to cause a great sound to
B．to set fire to
C．to destroy
D．to set out strong light
单项选择题
It can be inferred from the story that rich people like to ______.
A．live outside New York City
B．live in New York City
C．live in apartments
D．have many neighbors
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