云开题库
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Rose can do web-design.
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root对象实例仅是作为一个通用的包含树的根实例存在，是包含树的顶层根实例。
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Ron and Ann run the guesthouse.
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Rome is cheap for the local people.
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Rome is big and well-organised.
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Rome is a beautiful city.
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ROLLBACK表示事物正常结束，COMMIT表示事务中的全部操作被撤销。（）
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Roger and Morten were both from Zambia
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Roger and his teammates lost their rackets on their way
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Rockets have many drawbacks in terms of cost, payload, and safety.
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