单选题:Evolutionhasprogrammedmantosleepatnightchieflytohelphim_____

题目内容:

Evolutionhasprogrammedmantosleepatnightchieflytohelphim__________. A.maintainaregularpatternoflife
B.preventtroublethatcomeslookingforhim
C.avoiddangerandinefficientlabor
D.restorehisbodilyfunctions

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