拓展:注意下列句子中it的用法:
1) I hate it when people speak with their mouths full.我不喜欢人们说话时嘴里有满满的东西。) It is/was the+序数词+time+that...+主语+have/had done...这是某人第……次做…… 3) It is (high) time that...+主语+did/should do...是……该做……的时候了。 4)It’s up to sb. to do... 该某人做……了
2.But when I tried to step forward, I found I was carried twice as far as on the earth and fell over.(1)“A+倍数+形容词或副词的比较级+than+B”,A比B大(长、、)多少倍”。(2)“A+倍数+as+形容词或副词的原级+as+B”,A是B的多少倍”。(3)“A+倍数+the size/height/length/width, etc.+of+B”,A是B的多少倍”。(4)“A+倍数+what从句”,A是……的多少倍”。Asia is four times as large as Europe.=The size of Asia is four times that of Europe. =Asia is four times the size of Europe.=Asia is three times larger than Europe. 亚洲是欧洲的四倍大(比欧洲大三倍)。Our total income of 1994 was double that of 1992.我们1994年的总收入是1992年的两倍。The production now is three times what it was ten years ago.现在的产量是十年前的三倍。What a table! I've never seen such a thing before. It is not half as wide as it is long. ●重点单词
1. n.天文学→astronomer n.天文学家 2. n.系统;体系;制度 3. n.学说;理论→theoretical adj.理论上的 4. n.球体;地球仪;地球→global adj.全球性的;全世界的
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