美股涨幅扩大，纳指上涨2%，标普500指数上涨1.4%，道指上涨0.95%。

Group 1 - The U.S. stock market saw significant gains, with the Nasdaq rising by 2% [1] - The S&P 500 index increased by 1.4% [1] - The Dow Jones Industrial Average rose by 0.95% [1]