练习：
1. What form of potato is the most nutrient to the human body?
A Potato soup.
B Potato cake.
C Potato salad.
D Hot boiled potato.
2. What does the reduction in leucocyte levels in the body mean?
A It may mean the reduced levels of inflammation.
B It may mean somewhere in the body is inflamed.
C It means that the body is challenged.
D It means that the body cannot produce leucocytes any more.
3. For what a purpose did the researchers use raw potato starch in their experiment?
A They warned 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.
4. All of the following foods are rich in resistant starch EXCEPT
A pasta
B grains
C legumes
D vegetables
5. What a kind of starch is resistant starch after all?
A It may cause irritable bowel syndrome.
B It may bring about at least partially inflammatory disorder.
C It may raise leucocyte and lymphocyte levels in the body.
D It cannot be digested in the small intestine and ferments in the large intestine.
答案与题解：
1．C 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”，因此在四个选项中最有营养的非C项莫属。
2．A 第二段第三句说，“淋巴细胞水平低显示炎症水平下降”，故其他B、C、D三个选项均不正确。
3．B 第二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丁的土豆淀粉，就是为了模拟富含耐久淀粉的饮食所起的作用”，其他A、C、D三个选项文章均没有提及。
4．D 第四段第一句列出了一些富含耐久淀粉的食品，其中就没有D项“蔬菜”，而且实际上蔬菜也不是富含淀粉的食物。
5．D 第四段倒数第二句已经解释了耐久淀粉的特点：“不能在小肠中消化，而是分流到大肠，在大肠中发酵”。其他选项个别词语虽在短文中出现过，但都不是说明耐久淀粉的。
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