美股涨幅扩大，纳指涨超1%，道指涨0.7%，标普500指数涨0.7%。

Group 1 - The U.S. stock market has seen an increase, with the Nasdaq rising over 1% [1] - The Dow Jones Industrial Average increased by 0.7% [1] - The S&P 500 index also rose by 0.7% [1]