根据你所学的知识回答问题。 （1）物质是由微小粒子构成的，如：二氧化碳是____
题型：填空题
问题：
根据你所学的知识回答问题。
（1）物质是由微小粒子构成的，如：二氧化碳是________构成；水银是由_________构成；食盐是由_________构成的。
（2）若用“
”表示氢原子，用“
”表示氧原子，则保持水的化学性质的最小粒子可以表示为_______。
（3）电解水这个变化中的最小粒子________，水蒸发变化中的最小粒子_________。
题型：填空题
读一读，判断正(√)误(×)。
Last week I went to Hainan for vacation. I went there by train. The train was late for three hours. The first day in Hainan I had fish and crabs. And I had a bad stomachache. From the second to the fifth day, I couldn't go out, because it rained all day. It was sunny the last day. I didn't go swimming because I went to see the doctor. I had a bad vacation.
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