美股三大指数小幅高开，芯片股走高，美光科技涨超4%

Group 1 - The U.S. stock market opened slightly higher, with the Dow Jones index up by 0.04%, the S&P 500 index up by 0.03%, and the Nasdaq Composite index up by 0.01% [1] - Chip stocks saw an increase, with Micron Technology rising over 5% as the company raised its earnings forecast for the fourth quarter [1] - AMC Theatres experienced a significant rise of 9%, reporting a 35.6% year-over-year increase in second-quarter revenue [1]