A、Over 700 million. B、Over 400 million. C、Over 2.3 billion. D、Over 3 billion. A题目问的是根据世界健康组织，全球肥胖人口的估计人数是多少。由定位句可知，肥胖的人数是7亿多。故选A

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 a-dults 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 to 25, with more than 25 considered overweight and above 30 obese.
    Q16: Which of the following can best describe the main idea of the talk?
    Q17: According to the talk, which of the following can be made worse by the growing obese population?
    Q18: According to WHO, by 2015, what would be the estimated figure of the global obese population?