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下列物质的化学式的读法和写法都正确的是

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  • 【名词&注释】

    氧化铁(iron oxide)、碳酸钠(sodium carbonate)、氢氧化钾(potassium hydroxide)、篮球队(basketball team)、化学式(chemical formula)、可数名词(countable nouns)、事业成功、离不开

  • [单选题]下列物质的化学式的读法和写法都正确的是

  • A. 碳酸钠Na
    B. CO3
    C. 硫酸H2SO4
    D. 氧化铁O3
    E. Fe2
    F. 氢氧化钾K(OH)2

  • 查看答案&解析 点击获取本科目所有试题
  • 举一反三:
  • [单选题]________________ is introducing Auld Lang Syne to us.
  • A. Robert Bums. B. The Washington Saxophone Quartet.
    B. Buddy Thomas. D. The passage doesn’t tell us.

  • [单选题]Why was Mrs. Green surprised? __________ .
  • A. Because her husband didn’t arrived the airport on time
    B. Because her husband was still at the airport at 5 o’clock
    C. Because her husband didn’t want to go to London

  • [单选题]When do you have history?—_______10:00.
  • A. on
    B. In
    C. At
    D. For

  • [单选题]7.—Are broccoli and carrots __________.—Yes,they are.
  • A. fruit
    B. dessert
    C. vegetable
    D. vegetables

  • [单选题]Water is the __46___ of all the things we eat and drink . Not many people understand this but __47____ quite true . The human body can go without ___48___ for a long time . We’ve got many examples for this . Yet two __49___ three days without water can usually make people __50____ . Man can’t live __51____ water .Many people don’t understand how ___52__ water the human body needs __53___ work well , and many people , especially young people , do not drink enough , ___54__ in very hot weather . Our body has mostly water , about 65% to 75% . That is to say about two thirds of our body is water . When we do sports , some of the water will get away from our body . __55 _ we don’t drink some water , we won’t have enough water. And if we don’t have enough water , we’ll feel tired and many of us will get ill . So you know how important water is to us .
  • A. 46.___________
    B. important
    C. most important
    D. more important
    E. different

  • [单选题]43.
  • A. kept
    B. continued
    C. lasted
    D. tried

  • [单选题]Communication is important because it can help people to ______.
  • A. understand the world and other people better around us.
    B. teach each other to speak, write, read and draw.
    C. know what other people are thinking about
    D. learn about mountains,blue sea and other things.

  • [单选题]有一位篮球队队长在获得总冠军时说:“你以为这是一个人在战斗,那你就错了,这是五个人的运动。”材料说明
  • A. 合作离不开公平
    B. 合作就一定会取得成功
    C. 合作是事业成功的土壤
    D. 要合作就不能有竞争

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