阅读A英语大神求解 20
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21.B（第一段“tech companies from all over the world and show off their lastest products)
22.D(第二段”Unlike other earbuds, here one is connected to an app that lets the user filte different sounds)
23.D(最后一段“It also connects to an app on your phone, so you can check on the house whenever you're away")
22.D(第二段”Unlike other earbuds, here one is connected to an app that lets the user filte different sounds)
23.D(最后一段“It also connects to an app on your phone, so you can check on the house whenever you're away")
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