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

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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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