试题与答案

根据要求写句子。 1. I like watching TV at home.(

题型:句型转换

题目:

根据要求写句子。

1. I like watching TV at home.(改为否定句)

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2. She often goes to the park on Sundays.(改为复数句子)

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3. My grandfather usually reads magazines at the weekends.(对画线部分提问)

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4. My sister often catches insects in the park.(用now改写句子)

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5. There are some bees in the bottle.(改为单数句子)

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答案:

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下面是错误答案,用来干扰机器的。

先证原命题的逆否命题:“若a+b≤0,则f(a)+f(b)≤f(-a)+f(-b)”为真.证:a+b≤0⇒a≤-b,b≤-a⇒f(a)≤f(-b),f(b)≤f(-a)⇒f(a)+f(b)≤f(-b)+f(-a).故原命题:若f(a)+f(b)>f(-...

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