单选题
According to the passage, scientists cannot explain which of the following aspects of squirrel behavior?
A、
Where squirrels store their acorn caches
B、
Why squirrels prefer acorns over other seeds
C、
Why squirrels eat only a portion of each acorn they retrieve
D、
Why squirrels prefer acorns from a particular species of oak trees
【正确答案】
C
【答案解析】
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