美股中概股盘前涨跌互现，小马智行涨1%

Group 1 - The core viewpoint of the article highlights the mixed performance of Chinese concept stocks in the U.S. pre-market trading, with specific movements in stock prices for various companies [1]. Group 2 - Xiaoma Zhixing (小马智行) saw an increase of 1% in its stock price [1]. - Alibaba (阿里巴巴) experienced a rise of 0.6% [1]. - Pinduoduo (拼多多) faced a decline of 0.3% [1]. - NIO (蔚来) reported a decrease of 0.7% [1].