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
选 CD
翻译：许多被归于乌鸦的不寻常的举动 —— 诸如喝咖啡，或给饲主带来礼物 —— 都基于人们口耳相传，因此属于轶闻而非科学。
重复题，13 /50 第二题。
secondhand 间接得来的，非原始的，之前被其他人使用过的(二手的)，经营二手货的
anecdote 简短有趣的故事，名人轶事
speculation 思考，推测，推论，投机
hypothesis 前提，假设
