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The number of books in the bookshop ________ (be) about 10,000 and most of them are about science.
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Mum, do you mind my listening to music for a while?
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目前我市大部分新建的居民小区都安装了光纤网络,光纤的主要作用是( )
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禹死后,他的儿子启夺取了王位,建立了我国历史上第一个王朝——夏朝,我国开始了“公天下”的历史。
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