问题
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What does the professor imply about the spacecraft Clementine?A.It sent back the first col
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What does the professor mainly discuss?A.The development of the modern skyscraper.B.The sk
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What does the professor say about the invention of the elevator?A.It created design proble
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What topics related to the Nightcap Oak does the professor mainly discuss? Choose 2 answer
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The professor discusses an example of three friends who run out of gas. What point does he
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Not long ago, the Sahara had a different climate. What evidence does the professor mention