【判断题】Acknowledgements should be started with thanks for individuals and ended with thanks for institutions.
【单选题】宽松的财政政策和紧缩的货币政策使总需求曲线( )。
【单选题】my English teacher, I have become what I am. [ ]
【单选题】the Internet, our life becomes easier, faster and better. [ ]
【简答题】若(23-7) 7 =a 7 3 7 +a 6 3 6 +…+a 7 3+a 大 ,则a 7 +a 1 +a 3 +a 7 =______.