题目

听短文,选择适合的选项。 (1) Who is Grace's mother? A . Mary Brown. B . Anna Brown. C . Sally Brown. (2) Jack is David's _______ . A . father B . grandfather C . son (3) Dale and Grace are _______ . A . brothers B . sisters C . brother and sister (4) Sally is Dale's _______ . A . cousin B . sister C . friend (5) There are_______ people(人)in this family photo. A . 5 B . 6 C . 7已知,且,则在的展开式中,有理项共有_________项.
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