年月年月英語六級真題及答案-在線瀏覽
2025-02-28 03:34本頁面
【正文】 s, like all warmblooded animals, can keep our core body temperatures pretty much constant 2 regardless of what’s going on in the world around us. We do this by altering our metabolic(新陳代謝的 ) rate, shivering or sweating. Keeping warm and staying cool take energy unless we are in the ―thermoneutral zone‖, which is increasingly where we choose to live and work. There is no denying that ambient temperatures(環(huán)境溫度 ) have changed in the past few decades. Between 1970 and 2022, the average British home warmed from a chilly 13C to 18C. In the US, the changes have been at the other end of the thermometer as the proportion of homes with air conditioning rose from 23% to 47% between 1978 and 1997. In the southern states – where obesity rates tend to be highest – the number of houses with air conditioning has shot up to 71% from 37% in 1978. Could air conditioning in summer and heating in winter really make a difference to our weight? Sadly， there is some evidence that it doesat least with regard to heating. Studies show that in fortable temperatures we use less energy. 3. Less smoking Bad news: smokers really do tend to be thinner than the rest of us, and quitting really does pack on the pounds, though no one is sure why. It probably has something to do with the fact that nicotine is an appetite suppressant and appears to up your metabolic rate. Katherine Flegal and colleagues at the US National Center for Health Statistics in Hyattsville, Maryland, have calculated that people kicking the habit have been responsible for a small but significant portion of the US epidemic of fatness. From data collected around 1991 by the US National Health and Nutrition Examination Survey, they worked out that people who had quit in the previous decade were much more likely to be overweight than smokers and people who had never smoked .Among men, for example, nearly half of quitters were overweight pared with 37% of nonsmokers and only 28%of smokers. 4. Geic effects Yours chances of being fat may be set, at least in part, before you were even born. Children of obese mothers are much more likely to bee obese themselves later in life. Offspring of mice fed a highfat diet during pregnancy are much more likely to bee fat than the offspring of identical mice fed a normal diet. Intriguingly, th
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