[音频]During calls home every two weeks, my mother 1_____with me to take chemistry or biology. Science was the sameeverywhere, she said. And I, like everybody else from China,was well 2_____ in math, physics and chemistry. (To 3______ from a 4_____ six-year Chinese high school, one needs to take five years of physics, four years of chemistry and three years of biology.)
[音频]I hoped my 1______ would 2______ for lack of 3______. On weekend nights, when my American roommates were out 4_______, I would tell them I had planned a date with Dante or Aristotle. (They didn’t think it was 5______.)
据恩格尔定理,随着家庭收入增加,用于购买食品的支出占家庭收入的比重会
A. 上升
B. 下降
C. 大体不变
D. 时升时降
( )是向企业及其竞争者提供生产经营所需资源的企业或个人。
A. 供应商
B. 中间商
C. 广告商司
D. 经销商