再次应答能迅速产生效应是因为机体内有() A.被激活的巨噬细胞 B.一定水平的致敏淋

题型:单项选择题

问题:

再次应答能迅速产生效应是因为机体内有()

A.被激活的巨噬细胞

B.一定水平的致敏淋巴细胞

C.记忆细胞的存在

D.初次应答的残留抗原

E.T淋巴细胞的存在

考点:临床医学检验临床化学临床免疫学临床免疫学题库
题型:单项选择题

It was just three degrees above zero. “That’s cold,” thought Jane as she got ready to deliver her morning papers. Jane had 50 customers, and on cold mornings when she couldn’t ride her bicycle, it took her more than an hour to make her rounds. As she collected her papers and put them into a big canvas bag, Jane regretted that she hadn’t finished her math homework the night before. There was still time. She’d hurry with the papers and finish the math before breakfast.

Less than an hour later, Jane was nearly finished. She had only five customers to go. She could then head for home to complete her math while her room fixed breakfast. As she rounded the corner, she saw a car in the middle of the street. It was Mr. Zimmerman, the elder man, who walked with a walking stick. His car was out of gas.“I’d like to help Mr. Zimmerman,” thought Jane, “but if I do, I won’t have time to do my homework.” She hated to think what Mr. Roberts would say if she hadn’t completed her papers.

“It’s his own fault for running out of gas,” Jane talked to herself. “The station is only a half mile down the street. Surely Mr. Zimmerman can walk that far, even on a cold morning like this --- can’t he? ” As she walked down the street, Jane wondered what to do.

小题1:Jane delivers her paper______.

A.before she goes to school

B.on cold morning

C.with the help of Mr. Zimmerman’s car

D.on the way to school小题2:Mr. Zimmerman was old and_______.

A.couldn’t drive well

B.would have nobody to help him

C.was not rich enough to buy gas

D.was not able to walk a long way小题3:We know from the reading that______.

A.Jane couldn’t find any time to finish her homework

B.it took about an hour for Jane to send the papers

C.Jane would have her breakfast in the school

D.Jane likes to deliver papers on cold mornings小题4:The reading doesn’t say but we can infer(推断) that_____.

A.Jane bought the gas for Mr. Zimmerman

B.usually Jane delivers papers by bike

C.Mr. Robert doesn’t like Jane at school

D.Mr. Zimmerman had to leave the car for Jane

题型:单项选择题

我国自行研制的嫦娥二号探月卫星,于2010年10月1日18时59分57秒在西昌发射中心发射升空,届时它所探测到的有关月球的数据将更加翔实.在月球上,白天,在阳光垂直照射的地方温度高达127摄氏度;夜晚,温度可降低到零下183摄氏度.那么月球表面的昼夜温差是(    )℃.  

题型:单项选择题

天癸的产生主要取决于

A.肾中精气的充盈

B.脾气的健运

C.肾阳的蒸化

D.肝血的充足

E.肾阴的滋养

题型:单项选择题

根据汉语提示完成英语句子,每空一词。

1. 据我所知,萍萍的爸爸是名教师而不是工人。

                                            I know, Pingping's father is a teacher rather than a worker.

2. 从现在开始,你不应该再玩太多的电脑游戏了。

    From now on, you should              play computer games too much                           .

3. 数百万的农村孩子没见过电脑。 

                               children in the countryside haven't seen computers.

4. 当老奶奶让孩子们休息一下时,他们仍然继续工作。

    When the old granny asked the children to have a rest, they just                                        .

5. 那时警察在找那个失踪的孩子。

    At that time, the police                                            the lost child.

6. 那听起来是个不错的主意。

    That                            a good idea.

题型:单项选择题

下图为常见ROM的分类图。
       


图中标出的①、②、③、④相应的英文缩写是

更多题库