问题 单项选择题 A1/A2型题

关于免疫球蛋白,以下说法错误的是()

A.IgG是唯一可以通过胎盘的免疫球蛋白

B.新生儿血中IgM含量低,故易患革兰阴性杆菌感染

C.6~7岁时sIgA达成人水平

D.婴儿出生后可从母亲初乳中获得部分SIgA

E.来自母体的IgG于生后6个月时几乎全部消失

答案

参考答案:C

解析:sIgA在2~4岁时达成人水平,故选C。

阅读理解

Members of the working class have blue-collar jobs. They are construction workers, truck drivers, mechanican, steel workers, electricians, and the like. What makes this class differ from the lower class is, first, longer periods of employment—and therefore, more fixed incomes—and , second, employment in skilled or semi-skilled occupations, not unskilled ones. Although unemployment hits all levels of the American economy, including those of skilled and semi-skilled workers, it is most common at the bottom of the class structure and increasingly less common at each level upward. They consider themselves to be respectable and hard-working and they look down upon members of the “low” class, whom they often consider to be lazy, dishonest, and too ready to exploit public assistance.

Most people in the working class have at least high school education. Many have some experience of college(especially community college), though few are college graduates. Unionization has helped the working class, but a rapidly changing economy and frequent periods of high unemployment make it difficult for most of its members to be able to increase their savings greatly. Purchasing a house for people in this class is extremely difficult, although a certain percentage may receive houses from their parents. (Home-owning rises with social class.)

A greater number of the members of the working class take relatively little satisfaction in their jobs, because much of their work is ordinary and boring. As a result, many seek their main satisfaction in recreational activities. Many members of this class would like to earn enough money to leave their jobs and start their own businesses, though few make it. Many place their expectations on their children, hoping that they at least will rise in the ladder of success.

小题1: Which of the following is true about the working class?

A.They are often offered jobs with high incomes.

B.They are employed as skilled and semi-skilled workers.

C.They are often considered lazy and dishonest.

D.They are often exploited by the public.小题2: The word “hit” in paragraph one roughly means__________.

A.have bad effects on

B.break up

C.beat

D.strike with a blow小题3: Most people in the working class ________.

A.have at least some experience of college

B.receive houses from their parents

C.buy houses by themselves

D.have difficulty increasing their savings greatly小题4: Many members from the working class are not satisfied with their jobs because _____.

A.they are not interested in their jobs.

B.they could not earn much money

C.they are not their own bosses

D.they could not rise in the ladder of success

单项选择题