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本文是一篇应用文。文章主要介绍了2024年消费电子展的四款科技产品。2l.B细节理解题。根据Smart Mirror中“Paris-based company Baracoda says its BMind Smart Mirror can take..”及“The mirrorcan also guide you through tooth brushing and analyze your skin's needs.”可知，Baracoda公司生产的智能镜子可以分析使用者的皮肤。22.D细节理解题。根据Ampera中“LifeSpan's Ampera Bike combines the health benefits of a pedal desk with the energy..”及“..while enjoying the physical and mental benefits of staying active.”可知，用户使用Ampera,可以增加其运动量。23.C细节理解题。根据Squad Mobility's Electric Vehicle(E.V.)中“Squad Mobility's tiny solar-powered E.V.almost looks like achildren'stoy.”及Delta Pro Ultra中“Delta Pro Ultra from EcoFlow is a backup battery generator that runs on solar power,...”可知，Squad Mobility'sE.V.和Delta Pro Ultra都使用太阳能。