B.copper C.potassium

　　D.all metals B 1 2 3 4 5 6 7 答案 4.According to the passage，it can be inferred that

　　will have less use in making kitchen tools. A.aluminium

　　B.iron C.steel

　　D.copper A 1 2 3 4 5 6 7 答案 Passage B 5.The experiment shows us

　　. A.how iron rusts with air B.iron is quite easy to rust C.how to prevent iron from rusting D.how iron reacts with air and with water D 1 2 3 4 5 6 7 答案 6.“Air­free water” means “

　　”. A.air with a lot of water B.air without water C.water with a lot of air D.water without air D 1 2 3 4 5 6 7 答案 7.If some clean iron nails are put in a damp place for a week，the nails will

　　. A.rust

　　B.not rust C.form an oxide

　　D.keep the place dry 1 2 3 4 A 5 6 7 答案 Ⅲ.课文阅读填空 The reaction of metals When we use metals，it is important to know how they react with different 1.

　　.The reaction of metals with oxygen can be put 2.

　　.In the table potassium reacts most at the top and 3.

　　reacts least at the bottom. substances in order copper 答案 Iron­reaction 4.

　　In dry air Result：The nails have not rusted. Conclusion：Iron does not rust in

　　6.

　　air. In 5.

　　water Result：The nails do not rust in the 7.

　　with air­free water. Conclusion：Iron does not rust in

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