使用斐林试剂鉴定可溶性还原糖时，必须将斐林试剂的甲液和乙液

阅读短文，判断正误，正确的写“T”，错误的写“F”。

    Hello! I am Wang Hong. I like peaches very much. I don't like grapes. My father likes watermelons. He doesn't like strawberries. My mother likes bananas. She doesn't like pears.

①简化收款手续，方便购物消费   
②提高国民在国际上的形象和地位

③减少现金的携带，提高安全性   
④是一般等价物