阅读短文，下列问题

A

    It's two weeks before Christmas in England and Mrs. Smith is very busy. She buys a lot of Christmas cards to send to her friends and to her husband's friends. She puts them on the table in the room. Then, when her husband comes home from work, she says to him, “These are the Christmas cards for your friends. Could you please write the cards and I cook supper?”

    Mr. Smith doesn't say anything and walks into his study. After a while, he comes with a box full of Christmas cards. He puts them on the table and says, “They are from last year. I forgot(忘记) to send them.”

周某花999元买了一部华为手机，电信公司除分期返还500元话费外，两年内每月还赠送l50兆的流量。在这里（    ）

①999元是手机价值的货币表现

②150兆流量的价值是通过支付手段实现的

③通信公司的优惠利用了消费者的心理

④返还的500元话费执行流通手段的职能

读下图，完成下列问题。