问题 选择题

免疫是人体的一种生理功能,下列有关免疫的叙述错误的是

A.接种过水痘疫苗的人能抵抗水痘病毒的侵袭是因体内产生了抵抗水痘病毒的抗体

B.免疫具有监视、识别和清除体内产生的异常细胞的功能

C.分布在血液和组织、器官中的吞噬细胞,可以将侵入人体的病原体吞噬消化

D.特异性免疫和非特异性免疫都是人天生就有的免疫功能

答案

答案:D

题目分析:A、接种过水痘疫苗的人能抵抗水痘病毒的侵袭是因体内产生了抵抗水痘病毒的抗体并在人体内存留,再有水痘病毒侵入人体时,抗体就会将水痘病毒清除,人体就不会患水痘了,但有其他病原体侵入人体时,这种抗体则不起作用.A正确;B、免疫具有监视、识别和清除体内产生的异常细胞的功能.B正确;C、主要分布在血清中,也分布于组织液及外分泌液中.如当天花病毒侵入人体后,刺激淋巴细胞,产生抵抗天花病毒的特殊蛋白质,此蛋白质叫做抗体.C正确;D、非特异性免疫,是人生来就有的,对多种病原体都有防御功能.如:人体的第一、二道防线;特异性免疫是后天获得的,只针对某一特定的病原体起作用.如人体的第三道防线.D错误。故选:D

考点:此题考查的是人体的免疫功能。

问答题
阅读理解

阅读理解。

     Do you know Eskimos? Let me tell you something about their lives.

     Eskimos live near the North Pole (北极). There are only two seasons there, winter and summer.

     There is no spring or autumn there. The winter nights are long. You can't see the sun for more than

two months, even at midday. The summer days are long. For more than two months, the sun never goes

down and there's no night.

     Eskimos have warm clothes. They make their clothes from the skins of animals. From skins (皮毛)

they make coats, caps and shoes.

      Near the North Pole trees can't grow, for it is too cold there. The Eskimos have to make their houses

from skins, snow or stone. When they got out in storms and can't get back home, they make houses of snow.

They leave these houses when the storm is over.

     Life is hard for the Eskimos, but they still like to live there.

1.Near the North Pole there are _____ in a year. [ ]

A. two seasons - winter and summer

B. two seasons - spring and autumn

C. four seasons

D. two seasons sometimes and four seasons sometimes

2.How long does the longest day or night last (持续) near the North Pole? [ ]

A. 24 hours

B. Over a week

C. A month

D. Over two months

3.Eskimos use skins to make _____. [ ]

A. clothes

B. houses

C. trees

D. both A and B

4.There are no _____ near the North Pole. [ ]

A. days

B. nights

C. trees

D. animals

5.Eskimos make houses of snow to protect (保护) themselves from _____. [ ]

A. animals

B. storms

C. snow

D. rain