题目内容
Even though there has been a （) with child prodigies for centuries, there has been little serious study of them until recently.
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（) the age of eight, he had performed in half the great cities of Europe.
The light from the sun moves away from its source in all directions, so its strength is very （) .
— I need to speak to Mr.Tucker.This is a very urgent matter.— （) .
The atoms of certain substance are excited in such a way （) they produce coherent light.
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