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  3. It’s fairly well known that a bad diet, a lack of exercise, and genetics can all contribute to type 2 diabetes. But a new global

It’s fairly well known that a bad diet, a lack of exercise, and genetics can all contribute to type 2 diabetes. But a new global

admin2020-01-09  139
问题     It’s fairly well known that a bad diet, a lack of exercise, and genetics can all contribute to type 2 diabetes. But a new global study points to an additional, surprising culprit: the air pollution emitted by cars and trucks.
    Though other research has shown a link between diabetes and air pollution in the past, this study is one of the largest of its kind, and it’s unique because it both is longitudinal and includes several types of controls. What’s more, it also quantifies exactly how many diabetes cases in the world are attributable to air pollution; 14 percent in 2016 alone. In the United States, it found, air pollution is responsible for 150,000 cases of diabetes.
    The study, published in The Lancet Planetary Health, linked data from 1. 7 million American veterans who had been followed for a median of 8. 5 years with air data from the EPA and NASA. It also aggregated past international research on diabetes and air pollution to devise a model to estimate diabetes risk based on the level of pollution, and it used the Global Burden of Disease study to estimate how many years of healthy life were lost due to this air-pollution-induced diabetes. Globally, 8. 2 million years of healthy life were lost in 2016 to pollution-linked diabetes, it showed.
    The study authors controlled for things like obesity and BMI, so it wasn’t the case that heavier people simply lived in more polluted neighborhoods and were also more likely to get diabetes.
    The particles examined in this study are known as PM2. 5, or particulate matter that’s 2. 5 micrometers big—30 times smaller than a human hair. They are emitted by various types of industry and fuel burning, but in the United States, the biggest source of PM2. 5 is cars, says Ziyad Al-Aly, the study’s senior author and an assistant professor of medicine at Washington University at St. Louis. When there’s lots of PM2. 5 in the air, the air might look smoggy or hazy. In lighter concentrations, the particles are invisible.
What’s special of this new global study?
选项 A、It shows a link between diabetes and air pollution.
B、It is one of the largest of its kind.
C、It both is longitudinal and includes several types of controls.
D、It quantifies exactly how many diabetes cases causes air pollution.
答案C
解析 推理判断题。根据选项定位到第二段。[A]“展示了糖尿病和空气污染之间的联系”这是别的实验也能做出的成果，错误；[B]“同类试验中最大的”，并不是特别之处；[D]“精确量化了有多少糖尿病会导致空气污染”，因果颠倒，不正确；[C]“它既是纵向研究，又包括几种类型的对照组”是文中提到的特殊原因，因此是正确选项。
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