题目

方框所给的选项中选出能填入空白处的最佳选项，补全短文。其中一项为多余选项。 Are you sometimes a little tired in the early afternoon? _____18．_____. They may think it’s because we eat too much. Or, in summer, they may think it is too hot. _____19．______. About eight hours after you wake up, your body temperature goes down. In many parts of the world, people take naps(打盹) in the middle of the day. This is really true when it’s warmer, and the hot weather makes work difficult in the early afternoon. Now researchers are saying that naps are g在某项体育比赛中，七位裁判为一选手打出的分数如下：90     89     90      95     93     94     93去掉一个最高分和一个最低分后，所剩数的平均值和方差分别为（ ）A．92，2B．92，2.8C．93，2D．93，2.8