美股中概股盘前涨跌互现，小马智行跌2%

Group 1 - The core viewpoint of the article indicates mixed performance among Chinese concept stocks in the US pre-market trading, with notable declines in several companies [1] Group 2 - Ctrip experienced a decline of 0.7% [1] - Alibaba saw a decrease of 1% [1] - Pony.ai faced a drop of 2% [1]