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According to Paragraph 3, what can be inferred about three-field system？
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(2010年考试真题)用工单位自用工之日起满一年不与劳动者订立书面劳动合同的，视为用人单位自用工之日起满一年的当日已经与劳动者订立无固定期限劳动合同。()
Shirley Allen loved to sing and play the piano. She studied music in college. Her dream was to become a【21】or singer.
Everything【22】when she was 20 years old. She became sick with typhoid fever and almost died. Doctors gave her【23】to help her get well, but the medicine【24】her to become totally deaf. She could no longer【25】the music which she had always loved.
Shirley would never give【26】playing the piano, but she did decide to change【27】. She transferred to Gallaudet University and studied English. In 1966 Shirley【28】from Gallaudet and looked for a job. She wanted to be independent.
She was asked to work at Gallaudet University as a【29】supervisor. Shirley supervised young women who lived on campus during the school year. She also taught English. Somehow she found time to【30】graduate school at Howard University in Washington, D.C. In 1972, Shirley received her M.A. degree in counseling【31】that institution.
Always ready for a new challenge, Shirley became a professor at National Technical Institute for the Deal' (NTID) in 1973 and she was also the【32】black and deal' teacher on campus. NTID is located in Rochester, New York. This college offers【33】and hard-of-hearing students technical and professional training.
This【34】woman became the first black deaf female in the world to receive her Ph. D in 1992, the【35】degree in 'education from the University of Rochester in New York.
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“十六十七世纪的科学家、哲学家都以为‘自然’这名辞，可以解决一切问题，有所谓自然公例(即“自然规律”——引者注)，自然状态，自然宗教，自然权利诸说。在当时天文、物理学发达，在此纯粹的自然界中，既经有如此的成绩，当然有人拿这方法推广到人事宗教方面去。所以当时宗教方面，不相信旧来的神学，而相信自然的宗教，在政治方面，推及到国家成立以先之状态，名之曰自然状态，而有所谓社会契约论，自然权利说。”从哲学上来说，这段话反映的观点属于
The underlined word "it" in the fifth paragraph probably refers to ______.
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