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下列代数式中,值一定是正数的是( )

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  • 【名词&注释】

    代数式(algebraic expression)、中秋节(autumn holiday)、好朋友(good friends)

  • [单选题]下列代数式中,值一定是正数的是( )

  • A. x2
    B. |-x+1|
    C. (-x)2+2
    D. -x2+1

  • 查看答案&解析 点击获取本科目所有试题
  • 举一反三:
  • [单选题]________________
  • A. ways
    B. matters
    C. habits
    D. ideas

  • [单选题]2. The mother is ________weak _________look after her little daughter.
  • A. too ,to
    B. so ,that
    C. very ,to
    D. so ,to

  • [单选题]CThey wear the latest fashions with the most up-to-date accessorise(配饰)。Yet these are ginrls in their teens or twenties but women in their sixties and seventies.A gengration which would once only wear old-fashioned clothes is now faouring the same high street looks worn by those half their age.
  • A. Professor Julia Twigg, a social policy expert , said ,“Wimen over 75 are now shopping for clothes more frequently than they old when they were young in the 1960s .In the 1960s buying a coat for a woman was a serious matter . It was an expensive item that they would puechase only every three or four years — now you can pick one up at the supernnackrt whosever you wish to .Fashion is a lot cheaper and peope fet tired of things more quickiy . ”
    B. Fashion designer Angela Barnard ,who runs own fashion business in London ,said older women were much more affected celebrity(名流) style. than in previous years .
    C. She said ,“When people see stars such as Judi Dench and Helen Mirren looking attractive and fashionable in their sixties ,they want to follow them . Older women are much more aware of celebrities .There’s also the boom in TV programmes showing people how they can change theiy look,and many of my older customers do roga to stay in shape well in their fifties . When I started my business a fen years ago .my older customers wended to be very rich, but now they are what I would call ordinary women .My own mother is 61 and she wears the latest fashions in a way she would caill ordinsry women .My own mother is 61 and she wears the latest fashions in a way she would never have done ten yeare ago.”
    D. 59. Professor Twigg found that ,compared with the 1960s,_______.
    E. the price of clothes has generally fallen by 70%
    F. the spending on clothes has increased by 5% or 6%
    G. people spend 30% less than they did on cotothes
    H. the amount of chothes bought has risen by 5% or 6%

  • [单选题]14.
  • A. are '
    B. is
    C. will be
    D. has been

  • [单选题]22. Last year they became good friends again __________ after they didn’t talk with eachother for a long time.
  • A. on Mid-Autumn Day
    B. the day before Mid-Autumn Day
    C. the day after Mid-Autumn Day
    D. two days before Mid-Autumn Day

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