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不能作为防腐剂的是( )。

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  • 【名词&注释】

    光合作用、防腐剂、生活史(life history)、形成层(cambium)

  • [单选题]不能作为防腐剂的是( )。

  • A. 尼泊金类
    B. 山梨酸
    C. 阿司帕坦
    D. 苯扎溴铵
    E. 硝酸苯汞

  • 查看答案&解析 点击获取本科目所有试题
  • 举一反三:
  • [多选题]在下列特征中,蓝藻门和红藻门相似的特征是( )。
  • A. 光合色素具藻胆素
    B. 生活史中无带鞭毛的细胞
    C. 具载色体和蛋白核
    D. 光合作用产物为裸藻淀粉

  • [单选题]大蒜的蒜瓣为( )。
  • A. 鳞叶
    B. 腋芽
    C. 变态根
    D. 块茎

  • [单选题]BWhen Mary Moore began her high school in 1951, her mother told her, "Be sure and take a typing course so when this show business thing doesn't work out, you'll have something to rely on." Mary responded in typical teenage fashion. From that moment on, "the very last thing I ever thought about doing was taking a typing course," she recalls.
  • A. The show business thing worked out, of course. In her career, Mary won many awards. Only recently, when she began to write Growing Up Again, did she regret ignoring her morn," I don't know how to use a computer," she admits.
    B. Unlike her 1995 autobiography, After All, her second book is less about life as an
    C. award-winning actress and more about living with diabetes (糖尿病). All the money from the book is intended for the Juvenile Diabetes Research Foundation (JDRF), an organization she serves as international chairman. "I felt there was a need for a book like this," she says."I didn't want to lecture, but I wanted other diabetics to know that things get better when we're self-controlled and do our part in managing the disease."
    D. But she hasn't always practiced what she teaches. In her book, she describes that awful day, almost 40 years ago, when she received two pieces of life-changing news. First, she had lost the baby she was carrying, and second, tests showed that she had diabetes. In a childlike act, she left the hospital and treated herself to a box of doughnuts (甜甜圈). Years would pass before she realized she had to grow up--again---and take control of her diabetes, not let it control her. Only then did she kick her three-pack-a-day cigarette habit, overcome her addiction to alcohol, and begin to follow a balanced diet.
    E. Although her disease has affected her eyesight and forced her to the sidelines of the dance floor, she refuses to fall into self-pity. "Everybody on earth can ask, 'why me?' about something or other," she insists. "It doesn't do any good. No one is immune (免疫的) to heartache, pain, and disappointments. Sometimes we can make things better by helping others. I've come to realize the importance of that as I've grown up this second time. I want to speak out and be as helpful as I can be."
    F. 61. Why did Mary feel regretful?
    G. She didn't achieve her ambition.
    H. She didn't take care of her mother.
    I. She didn't complete her high school.
    J. She didn't follow her mother's advice.

  • [单选题]听第6段材料,回答第 6~7 题。第6题:What is the man doing?
  • A. Changing seats on the plane.
    B. Asking for a window seat.
    C. Trying to find his seat.

  • [单选题]现存蕨类中,除了极少数如水韭属和瓶尔小草属等种类外,一般没有形成层(cambium)的结构。( )
  • A. 正确
    B. 错误

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