試卷：無年度 - 96年8月TOFEL閱讀(Page43-44)#20919
| 科目：TOEFL(Test of English as a Foreign Language)托福
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試卷名稱：無年度 - 96年8月TOFEL閱讀(Page43-44)#20919
科目：TOEFL(Test of English as a Foreign Language)托福
27. According to the second paragraph, crows are poor subjects for field research for all of the following reasons EXCEPT:
(A) They can successfully avoid observers
(B) They are hard to distinguish from one another
(C) They can be quite aggressive
(D) They are difficult to catch
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