One explanation Afor the tendency of animals to be Bless vigilant in smaller groups than in larger ones assumes Cthat the vigila

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问题 One explanation Afor the tendency of animals to be Bless vigilant in smaller groups than in larger ones assumes Cthat the vigilant Behavior—looking up, for example—is Daimed at predators.

选项 A、 
B、 
C、 
D、 

答案B

解析 less改为more。结合语境,这里应该说动物在小群体中比在大群体中警惕性更高。
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