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AP Chinese/Unit 4 – Science and Technology in China
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科技与公共交通效率
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在当今中国城市生活中，哪种科技产品在推动公共交通效率提升方面起到了显著作用？

A

智能手机地铁付费系统

B

共享自行车服务

C

新型空气净化器销售增长

D

多功能家庭机器人的流行

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