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.
If you’re thinking of a trip to India, you may imagine the majesty of the Taj Mahal, the thrill of an elephant ride or a chance to eat exotic curries. What you’re probably not imagining is checking into a hospital for major surgery. Yet an increasing number of Americans are doing just that. Americans are choosing to travel to countries such as India, Thailand and Mexico, as well as European destinations such as Germany, for medical procedures. The reason is simple: money.

选项 A、Because they can earn money while traveling.
B、Because they can save money in this way.
C、Because foreign countries provide better services.
D、Because foreign countries have better sceneries.

答案B

解析 讲话者指出美国人国外就医的原因很简单:因为钱。结合上下文可知,他们这样做可以省钱,而不是边旅游边挣钱。Taj Mahal,“泰姬陵”,是一座白色大理石建成的陵墓清真寺,印度最著名的古迹之一,世界文化遗产,“世界新七大奇迹”之一。
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