C．Vary their lifestyles constantly.

　　D．Change their genes completely.

　　答案：B　推理判断题。通过对整篇文章的理解尤其是第一段可知，少摄入食物可能延长人的寿命。故选B项。

　　27．What does the underlined sentence in the last paragraph suggest?

　　A．The research is effort­taking.

　　B．The result of the research is reliable.

　　C．The research has been done for a long time.

　　D．There's a long way to go to put the theory into practice.

　　答案：D　推理判断题。本句意为：延长寿命这个领域的研究才进行了10年，所以还停留在理论层面。由此可推断，要把这个理论付诸实践，仍然有很长的路要走。故选D项。

　　C

　　(2015·河北唐山质检)

　　If you see a group of people dancing and singing on the street or in the railway station, you don't need to feel surprised. They are a flash mob (快闪族), which is a group of people who come together suddenly in a public place, do something unusual for a brief period of time, and then quickly break up. They are usually organized with the help of the Internet or other digital communication network. At a predetermined time, they gather and perform some distractions (消遗) such as waving their hands and exchanging books. Then, they quickly break up before the police can arrive. Using mobile phones, the flash mob can change its location if the first one has been replaced for any reason.

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