U.S. stocks closed mostly lower on Monday, weighed down by a sharp selloff in energy shares. The S&P 500 closed 4.03 points, or 0.2%, lower at 2,071.12, while the energy sector lost 2.5%. The Dow Jones Industrial Average fell 24.39 points, or 0.1%, to 17,622.31. The Nasdaq Composite eked out a small gain, adding 2.84 points, or less than 0.1%, to 5,0340.70.
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