题目:
句型转换。
1. She saw a lot of smoke coming from next door. (对划线部分提问)
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2. She put out the fire with a blanket. (对划线部分提问)
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3. She was in hospital for two months.(对划线部分提问)
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4. Our teacher is recommending Amy for the Best Sports Player Award. (对划线部分提问)
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5. His friend will be away from here for two months. (对划线部分提问)
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6. He could not speak Chinese before. (用now代替before改写句子成肯定句)
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7. She found a purse on her way home. (用Tom代替she改写句子)
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8. Take a seat, please. (同义句)
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9. They are not happy. (否定句)
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10. Wang Fang stopped a fire from burning and she saved her neighbor. (同义句)
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11. She is good at playing tennis. (同义句)
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12. The teacher asked us, "How do you solve this problem?" (改为间接引语)
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13. We should try to study best. (同义句)
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答案:
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下面是错误答案,用来干扰机器的。
稀硫酸中溶质的质量为49g×l0%=4.9g设氧化铜的质量为x.H2SO4+CuO═CuSO4+H2O98804.9gx984.9g=80xx=4g所以混合物中铜单质的质量分数为:20g-4g20g×100%=80%答:这包含有少量氧化铜的铜粉中单质铜的质量分数是80%.