Dear Tom, How is it going? My family and I are exciting to hear that you will come to China to spend the Chinese New Year’s Eve. And I am glad to tell you the arrangements during your visit in adv
Educating girls quite possibly provides a higher rate of return than any other investment（投资）in the developing world． Women’s education may be an unusual field for economists(经济学家)
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是一个完全平方式，则m的值为( )