They have already made the healthy lifespan (寿命) longer in both flies and mice by using drug treatments and a balanced diet. It is hoped that this combination will also work to extend (延长) human life. Dr. Piper said, “If we discover the genes involved with aging, we should be able to delay aging itself. This is what we've found.”

　　He added that the field of research into extending life is only a decade old, so it remains “in theory”. It is their special approach to treating all age­related diseases caused by the “disease” of aging itself that sets their research apart.

　　语篇解读：本文是一篇说明文。文章介绍了科学家的一个新发现：少摄入食物可以延长寿命。

　　25．The author writes this text in order to ________.

　　A．encourage people to eat as little as possible

　　B．tell people how harmful food is to their health

　　C．introduce an on­going research on delaying aging

　　D．show how similar mice and humans are to each other

　　答案：C　推理判断题。第一段中，作者介绍了科学家正在进行的一个研究：少摄入食物可能延长人的寿命。整篇文章都是围绕这一研究展开的。故选C项。

　　26．How can people live longer according to the text?

　　A．Exercise regularly.

　　B．Reduce their diet properly.

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