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  3. 共用题干 第一篇Eating Potatoes Gives Your Immune System a BoostEating potatoes is n...

共用题干 第一篇Eating Potatoes Gives Your Immune System a BoostEating potatoes is n...

admin2020-12-24  25
问题 共用题干
第一篇

Eating Potatoes Gives Your Immune System a Boost

Eating potatoes is not only good for bowel health,but also for the whole immune system,especially
when they come in the form of a potato salad or eaten cold.In a study on an animal model,researchers in
Spain found that pigs fed large quantities of raw potato starch(RPS)not only had a healthier bowel,but also
decreased levels of white blood cells, such as leucocytes and lymphocytes（淋巴细胞）in their blood. White
blood cells are produced as a result of inflammation or disease,generally when the body is challenged.
The general down-regulation of leucocytes observed by the Spanish researchers suggests an overall
beneficial effect,a generally healthier body.The reduction in leucocyte levels was about 15 percent.Lower
lymphocyte levels are also indicative of reduce levels of inflammation,but the observed reduction in both
lymphocyte density and lymphocyte apoptosis is surprising.
In what was the longest study of its kind,pigs were fed RPS over 14 weeks to find out the effect of
starch on bowel health."The use of raw potato starch in this experiment is designed to simulate the effects of
a diet high in resistant starch,"said study leader Jose Francisco Perez at the Universitat Aut6noma de
Barcelona,Spain.
Humans do not eat raw potatoes,but they do eat a lot of foods that contain resistant starch,such as cold
boiled potatoes,legumes,grains,green bananas,pasta and cereals.About 10 percent of the starch eaten by
human is resistant starch一starch that is not digested in the small intestine and so is shunted into the large
intestine where it ferments.Starch consumption is thought to reduce the risk of large bowel cancer and may
also have an effect on irritable bowel syndrome(lBS).
Immunology expert Lena Ohman's team previously found that the overall lymphocyte levels do not vary
for lBS patients,but that lymphocytes are transferred from the peripheral blood to the gut,which supports
the hypothesis of lBS being at least partially an inflammatory disorder. She says the decrease in lymphocytes
observed by the Spanish is therefore interesting,and a diet of resistant starch may be worth trying in IBS
patients.Ohman is currently at the Department of Internal Medicine,Goteborg University,Sweden.The
study is published in the journal Chemistry and Industry，the magazine of the SCI.
选项 For what purpose did the researchers use raw potato starch in their experiment?
A:They wanted to observe how the leucocyte levels reduced in the experimental pigs.
B:They wanted to simulate the effects of a diet high in resistant starch.
C:They wanted to see how much potato an experimental pig ate every day.
D:They wanted to see how much body weight each experimental pig gained in the end.
答案B
解析短文开头第一句就说，“吃土豆有益于肠道健康，而且对整个免疫系统也有益，尤其是 吃土豆色拉或凉吃”。因此C项正确。
由文章第二段第三句“Lower lymphocyte levels are also indicative of reduce levels of inflammation”可知，“淋巴细胞水平低显示炎症水平下降”，故B、C、D三个选项均不正确。
第三段第二句引用了研究组负责人自己的话说，“在实验中使用未经加工的土豆淀粉， 就是为了模拟富含有耐久的淀粉的饮食所起的作用。"A 、 C、 D三个选项文章均没有提及。
第四段第一句列出了一些富含耐久淀粉的食品，其中没有D项“蔬菜”，而且实际上蔬 菜也不是富含淀粉的食物。
由文章第四段倒数第二句“About 10 percent of the starch eaten by human is resistant starch一starch that is not digested in the small intestine and so is shunted into the large intestine where it ferments.”可知，有耐久的淀粉的特点为：不能在小肠中消化，而是分流到大肠，在大肠 中发酵。故D项正确。第二篇 本篇文章主要介绍了大脑在人睡眠过程中进行记忆整理的科学发现以及两个相关实验。
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