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化学实验过程中要规范操作,注意实验安全。下列有关做法中错误的

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  • 【名词&注释】

    第一次(the first time)、球类运动(ball games)、小苏打(sodium bicarbonate)、悲天悯人(bemoaning)、不定冠词(indefinite article)、锲而不舍(perseverance)、“韬光养晦”、玻璃棒(glass rod)、稀释浓硫酸

  • [单选题]化学实验过程中要规范操作,注意实验安全。下列有关做法中错误的是

  • A. 洒在桌面上的酒精燃烧起来,立即用湿抹布或沙子扑灭
    B. 稀酸飞溅到皮肤上,立即用大量水冲洗再涂上3℅~5℅的小苏打溶液
    C. 点燃氢气前,一定要先检验氢气的纯度
    D. 稀释浓硫酸时,一定要把水注入浓硫酸中,并不断用玻璃棒(glass rod)搅拌

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  • 举一反三:
  • [单选题]We can read such a passage ______.
  • A. in a newspaper
    B. in a storybook
    C. in a picture book
    D. in a textbook

  • [单选题]20.
  • A. old
    B. many
    C. often
    D. far

  • [单选题]8. Betty can play ________ guitar, but she can't play ________basketball.
  • A. a;a
    B. the;the
    C. a;the
    D. the;/

  • [单选题]How long has Katy been in Nepal?
  • A. eight months
    B. six months
    C. four months
    D. one moth

  • [单选题]2. Don't talk to Simon like that. He is only _______ eleven-year-old boy.
  • A. a
    B. an
    C. the
    D. /

  • [单选题]原始地球的大气中没有哪种物质( )
  • A. 氧
    B. 二氧化碳
    C. 甲烷
    D. 氢

  • [单选题]15.
  • A. it
    B. they
    C. them

  • [单选题]What is the author’s purpose in writing the passage?
  • A. To give a prescription for insomnia.
    B. To urge people to sleep less.
    C. To analyze the sleep pattern of modern people.
    D. To throw new light on human sleep.

  • [单选题]下列词语中,加点字的注音完全正确的一项是( )
  • A. 追溯(shuò) 冗长(rǒnɡ) 栖息(qī) 锲而不舍(qiè)
    B. 虐待(nüè) 谩骂(màn) 奢侈(chǐ) 猝不及防(cù)
    C. 伫立(zhǔ) 憎恶(zènɡ) 横亘(ɡènɡ) 悲天悯人(mǐn)
    D. 沮丧(jǔ) 聆听(1ínɡ) 拘泥(nì) 韬光养晦(hùi)

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