按要求改写句子。
1. The apples are red. (划线部分提问)
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2. These flowers are nice. (划线部分提问)
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3. The coffee is bitter. (用sweet 改成否定句)
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4. It is small. It is purple. (两句并一句)
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5. An ice cream is five yuan. (划线部分提问)
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