-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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2.Hayes and her team studied mtDNA because ________.

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4.What is the story mainly about?

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