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| About Hearing Aids | |
| 摘 要： | Mr Green worked in a shop. The shop sold, cleaned and repaired hearing aids.O ne day an old m an entered the shop and put down a hearing aid in frontofM r G reen w ithout a word. “W hats the m atter with it?”M r G reen asked.The m an did not an- sw er. … |
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