S&P500 futures drop 0.6% after S&P500 posts first monthly decline since January<blockquote>标准普尔 500 指数自 1 月份以来首次月度下跌,标准普尔 500 指数期货下跌 0.6%</blockquote>
US stock futures fell in early pre-market trading on Friday after the S&P500 suffered worst month si