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  3. Rats that eat high levels of a natural sugar known as fructose (果糖) seem to age faster than other rats-and the same could be tru

Rats that eat high levels of a natural sugar known as fructose (果糖) seem to age faster than other rats-and the same could be tru

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问题      Rats that eat high levels of a natural sugar known as fructose (果糖) seem to age faster than other rats-and the same could be true for people who eat too much sweet  【C1】______
     Fructose, found 【C2】______  in honey and fruit, is used widely in foods  【C3】______   from soft drinks to yogurt. But【C4】______   its sweet taste is popular, the sugar could cause wrinkles and health problems, the researchers said. Dr. Moshe Werman and Boaz Levi of the Technion-Israel Institute of Technology  【C5】______ large amounts of fructose to laboratory rats. Writing in the Journal of Nutrition, they said the fructose-fed rats showed changes  【C6】______  the collagen (胶原质) of their skin and bones.
     Collagen, a fibrous protein found in connective tissue, bone and cartilage (软骨), basically holds the body together. The  【C7】______  of collagen is what causes sagging (松弛) and deep wrinkles in older people.
    The process affected, Werman’s team said, is known as "cross linking". "Too much cross-linking reduces elasticity and makes the skin 【C8】______  and rigid, and these are the conditions that encourage wrinkled skin," Werman said in a statement. He said the same could be true of people, 【C9】______   this has not been shown. "Americans are eating more and more 【C10】______   foods such as carbonated drinks, baked goods, canned fruits jams and dairy products that 【C11】______   fructose," Werman said. Other studies have shown that  【C12】______   fructose intake can affect how the body  【C13】   glucose(葡萄糖) and increases insulin(胰岛素) resistance-which can 【C14】______   be important measures of the  【C15】______   toward diabetes.
     The rats Werman worked  【C16】______  were fed much more than the 【C17】______   adult person might eat in a day, which is standard in such 【C18】______   The rats were fed 12.5 grams of fructose per kg (2.2 pounds) of weight every day for a year. To 【C19】______ , a person weighing 154 pounds (70kg) who drinks a quart (liter) of cola 【C20】______  about 60 grams of fructose, or 0.8 grams per kg of body weight.   
【C8】______
选项 A、flexible
B、tender
C、smooth
D、stiff
答案D
解析 词义辨析兼语义逻辑题。此处需要一个与rigid“刚硬的”语义并列的贬义形容词，故只能选stiff“僵硬的”。flexible“柔软的”，tender“嫩的”，smooth“平滑的”，均与rigid语义相反。  
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