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  3. The unhealthy ingredients and low nutrition content of the food can make you less active and lazy, new research shows. No surpri

The unhealthy ingredients and low nutrition content of the food can make you less active and lazy, new research shows. No surpri

admin2023-02-14  19
问题     The unhealthy ingredients and low nutrition content of the food can make you less active and lazy, new research shows. No surprises there.【C1】________ what is more shocking is that the energy-weakening effects of a junk food diet can persist,【C2】________after you switch to a healthy【C3】________.
    Two groups of female rats were fed different diets by researchers for a six-month period. One group ate unprocessed foods such as corn and fish meal【C4】________the other ate a diet【C5】________to imitate junk food; high in sugar, and lower in【C6】________. While understandably the group eating the ’junk food’ diet gained more weight than the other, they also【C7】________ from fatigue and became less active and less【C8】________ —ie: lazier. In fact, those rats fed junk food took twice as many, and longer breaks during tasks than the rats eating a healthy diet, even tasks which【C9】________ rewards.
    What is even more【C10】________is that switching these rats back onto a nutritious diet at the end of six months for nine days didn’t seem to reverse their weight gain or their ’learnt’ laziness. This could suggest that while an【C11】________case of bad food—say on holiday, will not have too much of a【C12】________ effect if you generally eat a good diet and lead a healthy lifestyle. But those who eat a poor diet【C13】________ the long term may actually become lazy and fatigued, as well as gaining weight and suffering the health consequences【C14】________being overweight.
    The research shows that switching【C15】________a healthy diet in the short term is unlikely to be【C16】________ to reverse any of the side effects of a diet high in junk food. "Overweight people are often regarded as lazy and lacking【C17】________says Blaisdell, a professor of psychology at UCLA. "We【C18】________our results as suggesting that the idea commonly【C19】________in the media that people become fat because they are lazy is wrong. Our data suggest that diet-induced obesity is a cause,【C20】________an effect, of laziness. Either the highly processed diet causes fatigue or the diet causes obesity, which causes fatigue."
【C4】
选项 A、while
B、because
C、if
D、and
答案A
解析 本句分别说明给两组小白鼠喂食，一组吃未经加工的食物(unprocessed foods)，另一组吃垃圾食品(junk food)。A项while“而”表对比关系，符合逻辑。B项because“因为”，表因果关系。C项if“如果”，引导条件状语从句。D项and表并列或顺接关系。而本句强调小白鼠吃的食物的种类的对比，这三项均不符合语义逻辑。
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