[单选题]
2.4
[39]. Crying was adaptive for our ancestors because____.(1分)
A) it H.E.lpE.D..tH.E.m G.E.t suF.F.iC.iE.nt nutrition (
B) it E.li
CitE.
D.sH.ort
EpisoD.E.s o
F.slE.E.p(C.) it D.E.lA.yE.D..nE.w prE.
GnA.nC.iE.s(D.) it H.E.lpE.D..tH.E..inF.A.nts lE.A.rn to spE.A.k.
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