Canadian scientists have calculated that one human being should be struck every nine years by a meteorite, while each year 16 buildings can be expected to sustain damage from such objects.
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Aone human being should be struck every nine years by a meteorite
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Ba human being should be struck by a meteorite once in every nine years
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Ca meteorite will strike one human being once in every nine years
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Devery nine years a human being will be struck by a meteorite
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Eevery nine years a human being should be struck by a meteorite
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正确答案: D