题目

阅读理解Moms tryso hard to make sure that their children are healthy. And this means that theytry and avoid foods that have too much sugar or artificial ingredients (人工添加剂). Sugary drinks can be one of the mainitems that moms avoid, and that is because they are bad for their children'steeth and health. A newstudy, however, is showing that a sugary drink in the morning may not be so badafter all, at least not for girls. According to Medical Xpress, consumingsugary drinks before class has been shown to improve math scores, but only ingirls. It has little impact on boys. This wassho2．以下说法不正确的是（　　）A．等式不一定是方程B．等式的两边分别同时加、减、乘、除以同一个数，所得结果仍然是等式C．方程3x=1.8与x+1.56=1.62中的X的值相同