What’s the main topic of the monologue?-考呗网题库移动版

单选题What’s the main topic of the monologue?

A．Different animals’yawns．
B．Human’s yawn．
C．Fish’s yawn．
D．Social animals’yawns．

参考答案A

解析:Today's discussion is about a common animal reaction--the yawn. The dictionary defines a yawn as "an involuntary reaction to fatigue or bore-dom". That's definitely true for human yawns but not necessarily for animal yawns. The same action, the yawn, can have quite different meanings in different species.
For instance, some animals yawn to intimidate intruders on their territory. Fish and lizards are examples of this. Hippos use yawns when they want to resolve a quarrel. Observers have seen two hippos yawn at each oth-er for as long as two hours before they stop quarreling.
As for social animals like baboons or lions--they yawn to set up the pecking order within social groups, and lions often yawn to calm social ten- sions. Sometimes these animals yawn for a strictly physiological reason--that is to increase oxygen levels. And curiously enough, when they yawn for a physical reason like that, they do what men do--they try to stifle the yawn by looking away or by covering their mouths.

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单选题What is the speaker’s main point?

A．Animals yawn for a number of reasons．
B．Yawning results only from fatigue or boredom．
C．Human yawns are the same as those of other animals．
D．Only social animals yawn．

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单选题According to the speaker，when are hippos likely to yawn?

A．When they are swimming．
B．When they are quarreling．
C．When they are socializing．
D．When they are eating．

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单选题What physiological reason for yawning is mentioned?

A．To exercise the iaw muscles．
B．To eliminate fatigue．
C．To get greater strength for attacking．
D．To gain more oxygen．

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