问题
选择题
Liu Ming wants to buy some school things. According to the list, if he buys twelve exercise books, four knives, five pens, double rulers and a pencil-box, he will pay .
| ||||||||||||||||||
答案
答案：A
题目分析：根据本题描述，他买十二本练习本，四把小刀，五支钢笔，两把尺子和一个铅笔盒，根据价格表描述，列式为：3*12+2.5*4+15*5+1.5*2+16=140，故选A。
点评：解答本题首先要理解小题内容，然后结合价格表信息列式，然后算出得数。