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It is said in Australia there is more land than the government knows _____. [ ]
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Mum, do you mind my listening to music for a while?
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《梦溪笔谈》记载了活字印刷术、新的灌钢技术磁针装置法等科学技术十分珍贵,其作者是: [ ]
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A group of adults, highly succeeded in their jobs, went to visit their old professor.
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