题目内容

Then the joke _______in a different way.

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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。

正弦交流电的三要素是指正弦量的 ()、() 和() 。反映正弦交流电振荡幅度的量是它的();反映正弦量随时间变化快慢程度的量是它的();确定正弦量计时始位置的是它的()。

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