A-A+ ______forms a natural boundary between Mexico 2022-08-06 13:39:02 问答库 阅读 179 次 问题详情 ______forms a natural boundary between Mexico and the United States.A.The Rio Grande RiverB.The Mississippi RiverC.The Colorado RiverD.The Gulf of Mexico请帮忙给出正确答案和分析,谢谢! 参考答案 正确答案:A