中华民族的历史是由各族人民共同缔造的，各民族之间有分有和，在交流与碰撞中不断融合。下列能正确反映南宋与少数民族政权并立的示意图是（    ）

物体受到两个力的作用时，如果保持　____ 　或　____ 　，这两个力彼此平衡．

将有“┎”形的装片放在载物台上，在显微镜下观察到的物像是‘┒’．

阅读下面的短文，从每题所给的A、B、C三个选项中选出最佳答案。

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