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GRE填空题及答案(汇总)

　　Many of the unusual behaviors attributed to crows — such as drinking coffee or presenting gifts to people who feed them — are based on (i)___ and therefore fall into the category of (ii)___ rather than science.

　　Blank (i)

　　Blank (ii)

　　A. long-term observation

　　D. anecdote

　　B. controlled experiments

　　E. speculation

　　C. secondhand testimony

　　F. hypothesis

　　答案请点击下一页>>