问题
填空题
客户在使用消息服务期间，服务费的计算和收取以（）为基本单位。
答案
参考答案：注册账户
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客户在使用消息服务期间，服务费的计算和收取以（）为基本单位。
参考答案：注册账户
Mary has some friends. Betty, Peter, Alice Mike. Mary is the oldest . Betty is thirteen years . She is younger than Mary and older than Peter. Alice is nine and Mike is seven. Betty and Peter are runners. But Peter runs faster. Mary and Betty like to . Mary plays better than Betty. Alice sings of them. Mary and Betty study in a middle school. Alice and Mike study in a primary school. They work hard at school. But Betty works . Her handwriting is good, .
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