单项选择题

It is certain that ______.

A．an object had exploded three miles above the forest
B．the explosion was not caused by a comet
C．an atomic explosion once happened above the ground
D．some form of life from other planets once visited the earth then
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单项选择题
Scientists found ______ in the area where an explosion ' had happened.
A．fragments of rock
B．a big hole
C．fallen trees destroyed by fire
D．a crashed spaceship
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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