皮皮学，免费搜题
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A. A scarcity of jobs in their field. B. Inadequate training in methods of biological research. C. Difficulties in classifying all of the varieties of owls. D. A lack of funding for their work with endangered species.
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【简答题】John Snow was born and worked as a __ 36 __ in Great Britain．Exactly, he was an anaesthetist， 37 means that he put people to sleep during operation．He also began to experiment using the same drugs to ...