The 2003 study about rats being tickled are mentioned in paragraph 4 in order to show that        .

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• 1The above text is mainly about        .

  A.human laughter has its origin in ancient animal play sounds

  B.brain regions for mem00 evolved earlier than those for laughter

  C.human laughter was once rooted in people's happiness

  D.humans actually develop from ancient animals

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• 2A person who calls for increased rules in the globalization of economy is most likely to be    .

  A.a supporter of free trade in the global market

  B.a critic of free trade in the global market

  C.the head of a large imitational company

  D.an exporter specialized in making dairy products

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• 3The author mentions Jamaica as an example to

  A.support an argument

  B.draw a conclusion

  C.introduce a topic

  D.describe a scene

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• 4We can know that both sides of the debate agree that free trade

  A.results in the rich countries' economic collapse

  B.widens the gap between the rich and poor

  C.makes it easier for nations to exchange goods

  D.has little potential to aid the poor countries

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• 5The growing link between the nations and people of the world is called

  A.diversity

  B.commerce

  C.communication

  D.globalization

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• 6According to the text, what is the most special about Jaak Panksepp's research、

  A.It focuses on animals' influence on human laughter.

  B.People's personalities are involved in the research.

  C.The research studies human brain as well.

  D.The research deals with laughter itself.

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• 7We can infer from the above text that

  A.Tecumseh Fitch and Robert Provine disagree with each other on laughter

  B.rats’ chirping and chimp’s panting are basically the smae

  C.most animals are able to laugh but need to be trained first

  D.human beings have now fully understood animals’ behaviors

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