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1.(¡ï¡ï¡ï¡ï¡ï)In July 1994 Jupiter, the largest planet in our solar system, was struck by 21 pieces of comet(åçÐÇ). When the fragments(Ë鯬)landed in the southern part of the giant planet, the explosions were watched by scientists here on earth. But what if our own planet was hit by a comet?

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