题目内容

Our reasons for laughter change _______time.

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Then the joke _______in a different way.

We laugh at jokes about people and their mistakes because we know something________they don't know.

VocabularySkill: Using the dictionaryWrite1 next to each noun.Write 2 next to each adjective.Write 3 next to each verb.eg _2 protective___ pretend_ embarrass_ nervous_ nature_ honesty_ distract_ effect_ breath_ effective_ prevention_ natural_ protect_ concentrate___ concentrated

编程练习：鹦鹉和麻雀都是鸟类，都能发出叫声，但声音不同，鹦鹉是鹦鹉的叫声，麻雀是麻雀的叫声。用多态的思路编程。