小妮测量一个物体的长度时，记录的数据分别是：7.50cm、7.51cm、7.53cm则这个物体的长度是（   ）

读下面的古诗，完成题目。

                                                                                                                                               望岳
                                                                                                                               岱宗夫如何？齐鲁青未了。
                                                                                                                               造化钟神秀，阴阳割昏晓。
                                                                                                                               荡胸生曾云，决眦入归鸟。
                                                                                                                               会当凌绝顶，一览众山小。