-Susan, would you like another cake?

-_______________. I'm full.

A.Yes, please B.My pleasure C.No, thanks D.Not at all

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Where did humans come from? An Australian researcher believes that she’s found the answer: river valley in the African country of Botswana (博瓦納).

Professor Vanessa Hayes from the Garvan Institute of Medical Research in Sydney said she and her team have traced (追蹤) modern humans back to small group of people who lived in this valley, according to the BBC.

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There are many other locations around the world where humans could have gotten their start. It is likely that mankind appeared in many places at the same time. “I increasingly think that there probably wasn’t a single population in which modern humans evolved (進(jìn)化). If that is the case, there is no ‘homeland’,” said Ryan Raaum, who researches African population genetics (遺傳學(xué)) at Lehman College, US.

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A.Australia. B.Botswana. C.South Africa. D.Latin America.

2.Hayes and her team studied mtDNA because ________.

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4.What is the story mainly about?

A.New findings about the origin of humans. B.New findings about mtDNA.

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