Lecture 3
Female Mule Deer respond to fawn’s cry even though the fawn is not her own, for its cause there are several explanations:
Recognizable error, the mule deer cannot tell the difference between the cry of her own fawn and other fawn. Not likely.Experiment: when a female mule deer’s fawn is right in from her, when she hears the cry in the microphone, she will also rush there immediately;
Bedded Fawn Theory, because their fawn is lying in the burrow, so they are concerned when they hear the cry.Not true.The deer with bedded fawn and the deer with active fawn (fawn standing outside) reacted the same when hearing cry, no difference in intensity.
Reciprocal altruism, expecting other mule deer would do the same for their fawn.
Lecture 4
Impulse Buying
以上就是5月18日托福听力机经整理，希望各位考友合理利用机经，认真备考，获得一个自己理想的成绩。
