【单选题】古巴比伦、古埃及时期的科技文化的萌芽不包括
【简答题】已知 是等差数列 的前 项和,且 , . (1)求数列 的通项公式. (2)设 ,求证:数列 为等比数列,并求数列 的通项公式.
【单选题】Would you like ______ another cup of coffee?
【单选题】已知数列4.6.8.10.12......的通项公式为
【单选题】Would you like ________ a cup of tea? [ ]
【单选题】听力原文:(A) The woman is drinking from a cup. (B) The woman is pouring water into the cup. (C) The woman is washing the cup. (D) The woman is filling up the cup.
【单选题】Life is a cup, and under most , it’s up to you to decide whether it’s a drinking cup (beiju) or a toothbrush cup (xiju).