【正确答案】 C

【答案解析】[听力原文] Obese and overweight people require more fuel to transport them and the food they eat, and the problem will worsen as the population literally swells in size, a team at the London School of Hygiene & Tropical Medicine says. This adds to the food shortage and higher energy prices, the school's researchers wrote in the journal Lancet on Friday. At least 400 million adults worldwide are obese. The World Health Organization (WHO) projects by 2015, 2.3 billion adults will be overweight and more than 700 million will be obese. In their model, the researchers pegged 40 percent of the global population as obese with a body mass index of near 30. Many nations are fast approaching or have surpassed this level. BMI is a calculation of height to weight, and the normal range is usually considered to be 18 or 25, with more than 25 considered overweight and above 30 obese. The researchers found that obese people require 1,680 daily calories to sustain normal energy and another 1, 280 calories to maintain daily activities, 18 percent more than someone with a stable BMI. Because thinner people eat less and are more likely to walk than rely on cars, a slimmer population would lower demand for fuel for transportation and for agriculture. This is also very important because 20 percent of greenhouse gas emission stem from agriculture. The next step is quantifying how much a heavier population is contributing to climate change, higher fuel prices and food shortage. 'Promotion of a normal distribution of BMI would reduce the global demand for it, and thus the price of, food,' Edwards and Roberts wrote. Which of the following can best describe the main idea of the talk? 全文讲超重和肥胖需要更多的能源和食物，而温室效应气体20%来自农业，因此可以认为肥胖加重了温室效应。

【正确答案】 C

【答案解析】[听力原文] According to the talk, which of the following can be made worse by the growing obese population? 从谈话中的第一句话可知，超重和肥胖人口需要更多的能源和食物，而肥胖人口数量的增加会使这个问题更加糟糕。因此会导致能源价格上升，食物短缺。

【正确答案】 A

【答案解析】[听力原文] According to WHO, by 2015, what would be the estimated figure of the global obese population? 从“The World Health Organization (WHO) projects by 2015, 2.3 billion adults will be overweight and more than 700 million will be obese. ”可知，到2015年，WHO预计的全球肥胖人口应该是“more than 700 million”，也就是“over 700 million”。

【正确答案】 D

【答案解析】[听力原文] According to the researchers, how much energy would an obese person need for a day? 从“The researchers found that obese people require 1,680 daily calories to sustain normal energy and another 1,280 calories to maintain daily activities. ”可知，一个肥胖的人一天所需的能量应该是1680+1280=2960。

【正确答案】 B

【答案解析】[听力原文] According to Edwards and Roberts, what would happen if we promote a normal distribution of BMI? 从“Promotion of a normal distribution of BMI would reduce the global demand for, and thus the price of, food. ”Edwards and Roberts wrote. ”可知，“a normal distribution of BMI”可以减少全球食物的需求和降低食物价格。