句型转换。

1. It's a book about London. (对画线部分提问)

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2. The desk is old. (改为一般疑问句)

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3. I will take a ball. (改为一般疑问句)

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4. On Tuesday I'll play with my friends. (对画线部分提问)

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5. My brother is taller than me. (改为一般疑问句)

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选择在放射性低本底区域进行讨论、等待工作，是减少（）。