标普500指数期货跌幅扩大至1%，纳斯达克100指数期货下跌1.5%

Group 1 - The core viewpoint of the article indicates a significant decline in U.S. stock index futures, with the S&P 500 futures down by 1% and the Nasdaq 100 futures down by 1.5% on December 11 [1]