What is the possible reason that some foods promote the brain performance?

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问题 What is the possible reason that some foods promote the brain performance?
  
Why certain food choices might help the brain function better remains unclear. Perhaps these regimens’ known cardiovascular benefits, which promote a good flow of blood and oxygen to the brain, are key. But other factors may be at work. Of course, questions about when these dietary changes need to happen or how diet stacks up against other factors, such as physical activity, sleep patterns and genetics also remain unanswered.
The fridge needs help. Because much of the energy we need to power it produces waste, pollutes the atmosphere and changes the climate. We can transition the way we produce and use energy in a way that will contribute to a sustainable future. We’re campaigning in countries all around the world to provide the solutions for governments, for companies and for all members of society to make the right choices about energy conservation and use.

选项 A、We need to change our fridge.
B、We need to conserve energy.
C、Sustainable development is challenged.
D、The atmosphere is polluted.

答案B

解析 此题考查的不仅是短文的主旨,还测试了听者对语段目的和功能的掌握。通过原文“We’re campaigning…to provide the solutions…”一句,可以判断讲话者和同伴们正在开展一项运动,再通过多次提及的主题词energy、use即可判断这是一项关于能源保护和使用的公益活动,这段讲话目的在于呼吁公众出谋划策,保护能源。讲话者以冰箱开头,只是为引起话题,以保护能源结束,是对整个讲话的总结。
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