a. reducing the harm blowing snow does to animals

　　b. supplying water resource to the nearby gas fields

　　c. making up for the lack of water resource.

　　d. keeping the traffic smooth

　　A. a,b,c          B. a,b,d             C. b,c,d            D. a,c,d

　　37. Science fairs are attractive to students because they ________.

　　A. can have their research put into practical use

　　B. can have their scientific ideas tested out

　　C. are allowed to help protect the local wildlife

　　D. can learn about the most advanced technology

　　38. Which of the following material can best replace snowing in Erica’s experiment?

　　A. Flour.         B. Sugar.           C. Salt.             D. Dishwasher powder.

　　C

　　If you want to stay young, sit down and have a good think. This is the research finding of a team of Japanese doctors, who say that most of our brains are not getting enough exercise and ,as a result, we are growing old unnecessarily soon.

　　Professor Taiju Matsuzawa wanted to find out why quite healthy farmers in northern Japan appeared to be losing their ability to think and reason at a rather early age, and how the speed of getting old could be slowed down.

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