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生态系统中的植物群落光能利用率一般是( )

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  • 【名词&注释】

    生殖细胞(germ cell)、植物群落(plant community)、雄激素(androgen)、生理功能(physiological function)、骨肉瘤(osteosarcoma)、光能利用率、皮肤癌(skin cancer)

  • [单选题]生态系统中的植物群落光能利用率一般是( )

  • A. 1%
    B. 5%
    C. 10%
    D. 20%

  • 查看答案&解析 点击获取本科目所有试题
  • 举一反三:
  • [单选题]生产力最大的生态系统类型是( )
  • A. 草原生态系统
    B. 海洋生态系统
    C. 淡水生态系统
    D. 森林生态系统

  • [单选题]lgHb可结合的氧量是 ( )
  • A. 1.34~1.39mL
    B. 2.34~2.39mL
    C. 3~5mL
    D. 3.34~3.39mL
    E. 12~15mL

  • [多选题]Direction: Pick out the appropriate expression from the eight choices and complete the following dialogue by blackening the corresponding letter on the answer sheet.
  • A. What happened?
    B. Nice to meet you.
    C. please take it easy.
    D. No trouble at all.
    E. Coffee, please.
    F. F. I forgive you.
    G. G. But he panned to.
    H. H. Can I have the bill?
    I. 56. Tom: Hello, first let me introduce myself. I'm Tom Hall, I am in charge of MAP Advertising.
    J. Tony: ______, I' m Tony Blair.
    K. 57. Student A: I am very grateful to you for taking so much trouble to explain the best way of getting there.
    L. Student B: ______.
    M. 58. Child: Mom, I'm very sorry, really. I didn't mean to hurt you.
    N. Mom: It's OK. ______. Do behave yourself next time!
    O. 59. Guest: Waiter! ______, please?
    P. Waiter: Yes, sir. Here is the bill. The total is 200 yuan.
    Q. 60. Doctor: ______? You don't look well.
    R. Patient: I broke my left leg when climbing the mountain yesterday.

  • [单选题]德育过程是对学生知、情、意、行的培养提高过程,其实施顺序是( )
  • A. 以“知”为开端,知、情、意、行依次进行
    B. 以“情”为开端,情、知、意、行依次进行
    C. 以“行”为开端,行、知、情、意依次进行
    D. 根据具体情况选择多种开端

  • [单选题]与放射物质无关的肿瘤是( )
  • A. 二血血病
    B. 皮肤癌(skin cancer)
    C. 肾癌
    D. 骨肉瘤
    E. 肺癌

  • [单选题]Diana was reading Harry Potter and the Goblet of Fire, completely ____ in the mysterious world.
  • A. being lost B.having lost
    B. losting
    C. lost

  • [单选题]动物对冷环境的适应最直接的方式是( )
  • A. 减少体内能源物质的消耗
    B. 主动地避开低温环境,进行迁移
    C. 降低体温和各种代谢反应进行冬眠
    D. 增加脂肪,减少热量的散失和增加体内产生的热量

  • [单选题]睾丸间质细胞的生理功能是 ( )
  • A. 营养和支持生殖细胞
    B. 起血睾屏障作用
    C. 分泌雄激素结合蛋白
    D. 产生精子
    E. 分泌雄激素

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