在“测定小灯泡的电功率”实验中，电源由两节新干电池组成，小灯泡L标有“2.5V”字样，滑动变阻器标有“20Ω 1Α”字样。

假设某国2013年的商品价格总额为18万亿元，流通中需要的货币量为3万亿元。若2014年该国劳动生产率提高20%，货币流通速度下降20%，若商品价格水平不变，2014年流通中需要的货币量为（   ）

My parents

    My parents work in a show factory. They get up at five thirty. They first get breakfast ready. Then they go to work by bus. They work there from eight to five. They come home at about six and prepare supper for us. Mother washes clothes in the evening. Father often makes toys for us. They are busy all day.

仔细阅读，判断句子正误。