题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项是多余的。 In many countries, it is important to have many children. . When people have a large family, they feel more happy and they will not feel lonely. However, most people think one or two children are enough, and many couples have no children. Because taking care of a child is very costly, financially, emotionally, and socially, many couples regard large families as a disadvantage. . Many parents want to give their children chances to experience a variety of situations. . Child（ x2y2+y7+y5z）÷y2等于（ ）A. x2+ y5+y3z B. x2y2+y5z C. x2y +y5z D. x2y2+y7+y5z A 【解析】（ x2y2+y7+y5z）÷y2= x2y2÷y2+y7÷y2+y5z÷y2= x2+ y5+y3z, 故选：A.