单项选择题

It was surprising that ______.

A．the "explosion" caused a loud sound and a big fire
B．the "explosion" caused much damage to the forest
C．scientists didn't explore that area right after the explosion
D．people can't make out the cause of the explosion

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热门试题

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

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