题目内容
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Different metals have different 1 .When we use metals, it is 2 to know how they 3 with different 4 .The reaction of metals with these substances can be put in 5 .From the 6 , we can find that potassium reacts 7 with oxygen and water while 8 doesn’t react with water.When we 9 calcium in oxygen, it burns to 10 an oxide.
答案:
解析:
解析:
1.uses 2.important 3.react 4.substances 5.order 6.table 7.most 8.copper 9.heat 10.form
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