题型:阅读理解 题类:常考题 难易度:普通
安徽省蚌埠铁中2019-2020学年高二上学期英语期中考试试卷
Darwin noted that some human emotional expressions might have started as part of a physiological function: for example, exposing the teeth to bite food. The function, however, took on meaning and became a form of communication which signals anger.
The same may be true for the animals. Baby monkeys cry for attention. They also cry to signal to an adult that they want to be carried.
"Chimpanzees do make upset voice when they are being weaned (断奶) by their mothers or have lost their mothers or another individual, " says Anne Pusey, a professor at the University of Minnesota. "They whimper (呜咽) and cry and scream. When we hear these calls, the emotion involved seems obvious. However, they do not weep in the sense of producing tears. "
The Iowan researchers can cause the same crying sounds by producing large decreases and then increases in blood flow. The blood flow also goes down when baby rats get cold. Thus, they conclude baby rats cry in the same way that we sneeze. Of course the rat baby could be crying because he's cold and wants his mother to know.
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