Many of the unusual behaviors attributed to crows

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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：C,D

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