【正确答案】 B

【答案解析】[听力原文] {{U}}Caffeine not only gives us a daily jump start, but new research suggests it also can enhance long-term memory.{{/U}} According to the US Food and Drug Administration, almost 90 percent of people worldwide consume about 200 milligrams of caffeine each day. That's equivalent to about one strong cup of coffee a day. Writing in "Nature Neuroscience", Johns Hopkins University researchers say their findings show caffeine boosts certain memories for up to 24 hours after being ingested. "We've always known that caffeine has cognitive-enhancing effects, but its particular effects on strengthening memories and making them resistant to forgetting has never been examined in detail in humans," said {{U}}senior author of the paper Michael Yassa, formerly of Johns Hopkins and now the University of California, Irvine{{/U}}. "We report for the first time a specific effect of caffeine on reducing forgetting over 24 hours." [解析] 细节题。由新闻中提到的new research suggests it also can enhance long-term memory(新的研究表明，咖啡因也能提高长期记忆)可知，这项研究主要是关于咖啡因对提高记忆力的作用，故答案为B。

【正确答案】 B

【答案解析】[解析] 细节题。新闻中提到迈克尔·亚萨是这篇研究报告的资深作者(senior author of the paper)，曾经在约翰霍普金斯大学(formerly of Johns Hopkins)，现在在加利福尼亚大学欧文分校(now the University of California, Irvine)，由此可知A、C、D都表述正确，故排除，只有B属于无中生有，故为答案。