美股收跌：道指跌1.86% 下跌445.41点

　　中新网4月16日电(谢艺观)15日，美股三大股指集体收跌。截至收盘，道指跌445.41点，跌1.86%报23504.35点；标普500跌62.70点，跌2.2%报2783.36点；纳指跌122.56点，跌1.44%报8393.18点。

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