why does a man 's hair become grey beforehis beard does

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• 根据首字母提示完成短文（八上寒假作业）When Mary Smith was a student,she always wanted to be a t___,because she liked children.When she was twenty-two y___ old,she began teaching in a small s___.She was a good teacher.The c___ liked to come to her class.One day,one of the girls in her class said to her,"Miss Smith,why does a m___ hair become white before his beard?"Mary laughed and a___,"I don`t know,but it h___ to my father!"The other children laughed when they h___ thi
• why does a man 's hair become grey beforehis beard does
• why does a man 's hair become grey beforehis beard does
• 帮忙算一下x/(1-cosx)的不定积分
• men's hair becomes grey first decause it's sixteen years older than their beard麻烦翻译一下