American Licensing Laws 题目：   In the early-nineteenth-century United States, the medical profession was largely unregulated. There were several competing schools of medic...

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WS 041L1

综合写作： The United States currently has high-speed railway lines on the East Coast of the country. The East Coast high-speed trains have been very successful, and some experts ...

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Human Responsibility for Megafaunal Extinctions     Paleontologists are intrigued by the question of what caused a diverse group of large animals (megafauna) to become e...

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