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    根据课文内容和重点短语填空

    　　A．Metals are widely used in the world．It’s hard to ________　________ a world without metals．If we want to use metals well, I think it’s necessary for us to know how exactly they ________　________ different substances, for example, water．From the table we know, ________, ________ and ________ can react with cold water．And ________, ________ and ________ can react with steam．But iron only has reaction with water and steam, ________ has no reaction with them at all．

    　　B．Let’s do an experiment aiming to find out if there’s a change in weight when copper burns in air．Use the following apparatus to do an experiment．Write down the method．

    copper, Bunsen burner, a balance, a crucible

    　　First, put the copper in the ________．Then put the ________ on the ________ and weigh it．Next heat the copper．Light the ________ and hold the ________ over it．Finally, weigh the copper again．

    　　Result：It weighs a lot heavier than before．

    　　Conclusion：There is a change in weight when copper burns in air．

    答案：
    解析：

    　　A．think of　react with　potassium　sodium　calcium　magnesium　aluminum　zink　partial　copper

    　　B．crucible　crucible　balance　Bunsen burner　crucible


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