文章内容涉及到马铃薯对免疫系统所起的作用的论述。
2. 直接解题。
1 What form(形式，表格，构成) of potato is the most nutrient(最有营养的)to the human(人， 人类的，人的) body(身体，尸体)?
a) Potato soup(汤) .
b) Potato cake(蛋糕).
c) Potato salad(沙拉).
d) Hot(热的， 辣的) boiled(煮熟的) potato.
1.C. 细节题。 利用问题句中以最高级的形式出现的修饰结构及细节信息结构(the most nutrient， human body)及被选项中的细节信息词(A： soup; B： cake; C： salad; D： boiled potato)共同作为答案线索， 在文章中查找答案相关句：
(第一段)Eating potatoes is not only(不仅...而且...) good for(对...有益) bowel(肠) health(健康)， but also for the whole(所有的，整个的) immune (免疫的)system(系统)， especially(尤其) when they come(来，出现) in the form of (以...的形式)a potato salad or eaten cold(冷的，不热情的， 感冒). In a study on an animal model， researchers in Spain found that pigs fed large quantities of raw potato starch (RPS)1 not only had a healthier bowel， but also decreased levels of white blood cells， such as leucocytes and lymphocytes in their blood. White blood cells are produced as a result of inflammation or disease， generally when the body is challenged.
答案相关句说，“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，等土豆凉下来的时候吃”，因此C是答案。
2 What does the reduction in (在...方面的减少)leucocyte(白细胞) levels(水平， 使...水平) in the body mean(意味着)?
a)It may mean the reduced(减少的) levels(水平) of inflammation(炎症， 怒火).
b)It may mean somewhere(某处) in the body is inflamed(发炎的).
c)It means that the body is challenged(被挑战).
d) It means that the body cannot (不再...)produce(产生) leucocytes(白细胞) any more.
2. A. 细节题。 利用问题句中的细节信息词(leucocyte)及被选项中的细节信息词和修饰词(A：inflammation， B： inflamed; d： leucocyte)共同作为答案线索，在文章中查找答案相关句：
(第一题答案相关句)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)1 not only had a healthier bowel， but also decreased levels of white blood cells， such as leucocytes and lymphocytes 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(下调)(与问题句中的核心词reduction词义相关) of leucocytes observed by the Spanish researchers suggests an overall beneficial effect， a generally more healthy body.2 The reduction in leucocyte (白细胞)levels (这个结构是问题句中的核心结构)was about 15 percent(百分之...). Lower(较低的) lymphocyte levels are also indicative of(显示) reduced(减少的) levels(水平) of inflammation(炎症)， but the observed(被观察到的) reduction in both lymphocyte(淋巴细胞) density(密度) and lymphocyte(淋巴细胞) apoptosis(细胞自然死亡) is surprising(令人感到吃惊的).
答案相关句(第二段第三句)说“淋巴细胞水平低显示炎症水平下降”，故其它B、C、D三个选项均不正确。
3 For what purpose(目的) did the researchers(研究者) use raw(没有加工的) potato starch(淀粉) in their experiment(实验)?
a) They wanted to (想要)observe(观察) how the leucocyte(白细胞) levels reduced(减少) in the experimental(实验的) pigs(猪)?
b) They wanted to simulate(模仿) the effects(影响，结果) of a diet(饮食) high(高的， 高处的，高等的) in resistant(抵抗的， 有抵抗力的) starch(淀粉).
c) They wanted to see(了解，看见) how much (多少)potato an experimental pig (实验猪)ate(吃) every day(每天).
d) They wanted to see how much body weight (体重)each experimental pig gained(增加，获得) in the end(最后， 最终).
3.B. 细节题。利用问题句中的细节信息结构(raw potato starch)及被选项中的细节信息词(A： leucocyte， B： resistant starch; C： experimental pig; D： body weight)共同作为答案线索， 在文章中查找答案相关句：
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)1 not only had a healthier bowel， but also decreased levels of white blood cells， such as leucocytes and lymphocytes in their blood. White blood cells are produced as a result of inflammation or disease， generally when the body is challenged.