400-600-1123
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答案：
E
100的倍数
条件一，x<500，说明x的范围从[450，550)缩小到[450,500)，y还是在[350，450)之间，所以x+y的范围在[800，950)之间，所以无法确定是最接近于800 还是900，不充分。
条件二 y<400，说明y的范围从[350，450)缩小到[350，400)，x的范围为[450，550)，所以x+y的范围为[800,950）之间，有800和900 无法确定，所以不充分
联立：x的范围为[450，500),y的范围为[350，400)，x+y的范围为[800,900），还是有800和900两个值，无法确定，不充分。
所以，选E
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