GRE Text Completion: JiJing 1373-GRE填空机经1373题 - _4HJ_A2P71V1UJ7GA

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. A. long-term observations B. anecdote C. controlled experiments D. speculation E. secondhand testimony F. hypothesis