美股开盘：纳指小幅高开 美光科技涨超4%

Group 1 - The three major U.S. stock indices opened slightly higher, with the Dow Jones up 0.04%, the S&P 500 up 0.03%, and the Nasdaq Composite up 0.01% [1] - Chip stocks rose, with Micron Technology increasing by over 5% as the company raised its fourth-quarter earnings forecast [1] - AMC Theatres surged by 9%, reporting a 35.6% year-over-year increase in second-quarter revenue [1]