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第1题

吗啡可降低呼吸中枢对CO2的敏感性，使呼吸变快。
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第2题

Elizabeth Blackwell was born in England in 1821, and moved to New York City when she was ten years old. One day she deci
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第3题

Sparing no thought for her own safety, she dived into the river ________________ the child. （1 分） A. saving B. being
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第4题

Our boss told me my plan was still _________________ discussion. （1 分） A. in 　　 B. under 　　 C. of 　　 D. with
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