问题 选择题

我国科研工作者已经研制出预防“非典型肺炎”病毒灭活疫苗.该疫苗在人体免疫中属于(  )

A.免疫细胞

B.抗体

C.传染源

D.抗原

答案

人体有防御病原体的三道防线,其中,人体的第三道防线由免疫器官和免疫细胞(主要是淋巴细胞)组成,当病原体进入人体后,会刺激淋巴细胞产生一种抵抗该病原体的特殊蛋白质,叫做抗体,抗体能够帮助人体清除或灭杀进入人体的病原体,引起人体产生抗体的物质叫做抗原;疫苗正是利用了这个原理,用灭活了的病原体刺激人体的免疫系统产生抵抗该病原体的抗体,当人体再次接触该病原体后,体内产生的抗体便能将其消灭.因此疫苗在人体免疫中属于抗原.

故选:D

单项选择题
阅读理解

A group of people asked this question to a group 4-to-8-year-old children. “What does love mean?” The answers were surprising. The children would answer like they did below.

“When my grandmother hurt her knees (膝盖), she couldn’t bent (弯腰) over and paint her toenails (脚指甲) any more. So my grandfather does it for her all the time, even when his hands hurt too. That’s love.”

Rebecca–age 8

“Love is when someone hurts you. And you get so mad but you don’t shout at them because you know it would hurt her feelings.”

Samantha–age 6

“Love is what makes you smile when you’re tired.”

Terri–age 4

“I let my big sister pick on (捉弄) me because my mum says she only picks on me because she loves me. So I pick on my baby sister because I love her.”

Bethany–age 4

“I know my older sister loves me because she gives me all her old clothes and has to go out and buy new clothes.”

Lauren–age 4

“Love is when Mommy gives Daddy the best piece of chicken.”

Elaine–age 5

“My mommy loves me more than anybody. You don’t see anyone else kissing me to sleep at night.”

Clear–age 5

“You really shouldn’t say ‘I love you’ unless you mean it. But if you mean it, you should say it a lot. People forget.”

Jessica–age 8

小题1: The passage mainly tells us about ______.

A.what “life” means to children

B.what “family” means to children

C.what “friends” means to children

D.what “love” means to children小题2:Who told us the love between mum and dad?

A.Clear.

B.Elaine.

C.Rebecca.

D.Lauren.小题3:Which of the following is NOT true?

A.Rebecca’s grandmother ever couldn’t bend over.

B.Bethany is willing to be picked on by any other person.

C.If Samantha becomes angry, she will not shout at others.

D.Lauren prefers to wear her sister’s old clothes.小题4:What does Jessica mean about love?

A.Too much love is no love.

B.You should say love more often.

C.You mean what you think.

D.Say love more often if you have it.小题5:What is love according to Terri?

A.Love is the care between husband and wife.

B.Love is a rest when you are tired.

C.Love is what cheers you up when you are tired.

D.Love is a kiss from parents.