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
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
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
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