题目

阅读理解，阅读短文，然后从每题ABCD中选出一个能回答所提问题或完成所给句子的最佳答案。 Dave was a college student. His uncle was very rich, but he had no child of his own. Soon after Dave left college, his uncle died .He left Dave a lot of money , so he decided to set up his own company. He found a nice office , bought some new desks and chairs and moved in. He had only been there for a few hours when he heard someone coming towards his house. “It’s my first customer !” he thought . He quickly picked up the telephone and pretended （假装）t一个样本容量为的样本数据，它们组成一个公差不为的等差数列，若，且成等比数列，则此样本的中位数是A．B．C．D．