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The _____ of ophthalmology as a field in the United States from 1820 to 1850 is evident in the opening of at least five eye hospitals during this period, offering new venues for ophthalmic treatment and experimentation.
- A.sophistication
- B.retrenchment
- C.burgeoning
- D.resurgence
- E.curtailment
- F.expansion
C,F显示答案
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以上解析由 考满分老师提供。
