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The biggest advantage of this product is that＿＿＿．

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An old friend from abroad，＿＿＿I was expecting to stay with，telephoned me from the

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While＿＿＿in China，the young man picked up some Chinese．

根据下列文章，回答 46～50 题。
第 46 题 As pointed out at the beginning of the passage．people used to think that air pollution_____