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28. Elizabeth Blackwell, the first woman medical doctor in the United States, founded the New York Infirmary, an institution that has always had a completely female medical staff.
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36. One of the wildest and most inaccessible parts of the United States is the Everglades where wildlife is abundant and largely protected.
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37. Lucretia Mott¡¯s influence was so significant that she has been credited by some authorities as the originator of feminism in the United States.
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38. The activities of the international marketing researcher are frequently much broader than those of the domestic marketer. ¹ú¼ÊÊг¡Ñо¿ÕߵĻ·¶Î§³£³£½Ï¹úÄÚÊг¡Ñо¿Õß¹ãÀ«¡£
39. The continental divide refers to an imaginary line in the North American Rockies that divides the waters flowing into the Atlantic Ocean from those flowing into the Pacific. ´ó½·ÖË®ÁëÊÇÖ¸±±ÃÀÂåí¶É½ÂöÉϵÄÒ»µÀÏëÏóÏߣ¬¸ÃÏß°Ñ´óÎ÷ÑóÁ÷ÓòºÍ̫ƽÑóÁ÷ÓòÇø·Ö¿ªÀ´¡£
40. Studies of the gravity field of the Earth indicate that its crust and mantle yield when unusual weight is placed on them. ¶ÔµØÇòÒýÁ¦µÄÑо¿±íÃ÷£¬ÔÚ²»Ñ°³£µÄ¸ººÉ֮ϵؿǺ͵Ø᣻ᷢÉúλÒÆ¡£
