美股周四早盘，亚马逊（AMZN）下跌1%，此前该公司公布11月20日至12月1日黑色星期五/网络星期一活动，涵盖设备、电子产品和杂货数百万项优惠（含25美元感恩节套餐），并扩展当日达服务与AI购物功能。

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