The researchers said their findings were preliminary, and need much more information before they could be used commercially.

　　British experts pointed out that the study had looked at a very small number of people and did not make clear what genes were involved. Prof. Christine Williams, from the University of Reading, said, “This is a very interesting study—though very small. ” She said it would be useful to get a better understanding of what genes were involved. “It fits pretty well with some of our own studies which show that certain genotypes are more responsive than others to certain types of fats, eg diets high in omega-3 fatty acids(欧米珈-3脂肪酸), ” she added.

　　5. Which of the following is RIGHT according to the passage?

　　A. The study between DNA and losing weight can be used commercially.

　　B. Asians and Africans can lose weight easily because of their DNA.

　　C. Wrong diet can make you become two times fatter.

　　D. Studies show that certain genotypes can be responsive to some fats.

　　6. What’s the meaning of the underlined word in the first paragraph ?

　　A. primary

　　B. evident

　　C. fantastic

　　D. actual

　　7. According to Prof. Christine Williams, _______.

　　A. Genes involved with fat have been well understood by the researchers

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