A、The US. B、Japan. C、Russia. D、Sweden. B本题问的是诺贝尔奖得奖率最低的国家。短文中指出瑞典的得奖率最高，其次又指出日本排名最后。

Nations whose people consume the most milk and dairy products, per capita, also win the most Nobel Prizes, per capita, according to a new study published in the British journal Practical Neurology. Take Sweden, the country most associated with the Nobel prize. For every 10 million Swedes, there are 31. 855 Nobel prizes.(13)The Swedes also consume about 350 kg of milk each, on average, over the course of a year, reported the Los Angeles Times.(12)At the bottom of the list is Japan. The country has won 0. 06 Nobel Prizes per 10 million people and the average person drinks less than 50 kg of milk per year. The United States came in around the middle with 10. 731 Nobel wins per 10 million people and a milk consumption of about 250kg per person per year.(14)The study’s authors set out to find a link between milk and Nobel Prizes after reading a report last year that associated consumption of chocolate with Nobel wins. Although they found an association between a nation’s milk and dairy consumption and the number of Nobel laureates, their study didn’t prove a cause-and-effect relationship, cautions US News & World Report. Instead, the authors suggest that milk consumption might be a reflection of a strong educational system. They also noted that milk is rich in vitamin D, which research has shown may boost brain power.(15)Interestingly, chocolate consumption turns out to be a better predictor of Nobel wins than milk—bad news for parents everywhere.
12. Which country is the least associated with the Nobel prizes?
13. How much milk do the Swedes each consume over the course of a year?
14. What can we learn about last year’s report?
15. Why does the speaker say "bad news for parents everywhere" at the end?