D．Australia was also awarded in the competition

　　B

　　Thoreau and other naturalists have praised the benefits of nature to your state of mind in their works, but there are some researches showing how nature makes you smarter. A study has found that exposure to the great outdoors improves cognitive(认知的) function. Experts have called this attention restoration therapy(注意力修复治疗).

　　In the study, researchers from the University of Michigan asked a group of volunteers to complete a take designed to challenge memory and attention. The volunteers then took a walk in either a park or in downtown Ann Arbor. After the walk, volunteers returned to the lab and were retested on the task. The performance on the memory and attention task greatly improved in people following the walk in the park, but did not improve in those who walked downtown.

　　Why nature makes you smarter? According to the experts, one reason has to do with how nature affects your attention. You have two types of attention. One is involuntary, where your attention is attracted by some stimuli(刺激物). And the other one is directed attention, where you control your attention. Directed attention is important for memory, resolving conflict and reducing absent mind.

　　Being in nature exposes you to soothing stimuli that engages your involuntary attention. It gives your directed attention a rest and a chance to become renewed. When you are in a city, you are constantly vigilant(警觉的), your directed attention is turned on and cannot get a rest.

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