题干

下列有关特异性免疫的说法中正确的是

A:记忆B细胞再次受到相同抗原的刺激后能迅速产生抗体

B:效应细胞毒性T细胞和致敏B淋巴细胞遇到刺激后都能不断进行分裂

C:“甲流”患者在恢复过程中,效应B细胞能与病毒形成抗原—MHC复合体

D:浆细胞的寿命比记忆B细胞短而所含的内质网相对发达

上一题 下一题 0.0难度 选择题 更新时间:2015-09-23 05:12:30

答案(点此获取答案解析)

D

同类题2

任务型阅读

阅读下列短文,根据短文中的信息完成文后表格。在答题卡标有题号的横线上,写出空缺处所填单词的正确形式。(每空一词)

    Many people think dreams are full of messages that may not be clear to us common people. But if we think about what is going on in our lives, we can usually come up with an answer. Let's look at some of the most common dreams. What are the meanings of these dreams?

    Falling

    You're falling, falling, falling… and then you wake up. This dream is said to mean you are in fear of something or worried about something. There may be something in your life that is out of control and there is nothing you can do to stop it. Another explanation is that you may experience failure in something. Maybe you're not doing well in school or work.

    Taking an exam (or forgetting that you have one)

    You suddenly realize you have to take an exam at that very moment. You might be running here and there to find your classroom. Scientists say this dream may mean you're being tested about something or maybe you are facing a challenge.

    Flying

    Dreaming that you are flying means you are on top of things. You are in control of the things that matter to you. It may also mean you have confidence in yourself and think no one and nothing can beat you.

    Trying to run, but going nowhere

    You're trying to run, but either of your legs won't move or you simply aren't going anywhere. Some scientists think this dream means you're trying to do too many things at once and can't catch up or move forward.

    In fact, unlike these dreams, there are also many strange dreams that scientists may not be able to explain.

Title: What do dreams ____?

Descriptions of dreams

Answers to dreams

Falling

*You have something to be ____of or worry about.

*You may ____ in something like schooling or work.

Taking an exam

(or forgetting that you have one)

* Maybe you're taking part in a ____ .

* You may face something ____ .

Flying

*You're able to ____what matters to you.

*You believe in yourself and think that you can beat anyone and ____.

Trying to run, but going ____

*You're trying to do too many things at the same time and it prevents you from ____ forward.

Conclusion: Scientists can ____ some dreams, but not all the dreams.

同类题3

阅读下列材料:

【材料一】联合国宪章“是一部美国文献”,虽然在某些方面美国对苏联做出了让步,但实际上美国有“隐蔽”,几乎所有拉美二十多个国家政府一致在重要问题上跟着华盛顿投票,华盛顿利用它的多数席位可使控制票数不足的莫斯科屡次反对却归于无效。

──选自王斯德《世界当代史》

【材料二】1965年,根据第三世界国家的建议,联合国大会将安理会的非常任理事国从原来的6个增加到10个,经济及社会理事会的理事国从1973年起增加到54个。这些增加的名额,大多数给了亚、非、拉国家,这就使得联合国中第三世界反对殖民主义和霸权主义的力量逐渐占据上风。

──选自王春良《亚非拉民族解放运动史》

【材料三】海湾国家伊拉克与科威特围绕主权和边界问题一直存在争端。1990年8月,伊拉克对科威特发动突然袭击,不到一天就占领了科威特全境。

战争爆发的当天,联合国安理会召开紧急会议,要求伊拉克从科威特无条件撤军,但伊拉克对联合国的决议置之不理。1990年11月,安理会通过的678号决议规定,如果伊拉克不在1991年1月15日以前执行联合国决议,安理会成员国将“使用一切必要手段……恢复该地区的国际和平与地区安全。”

──选自《当代国际关系史》

(1)材料一表明美国对建立之初的联合国有何影响?它是通过什么方式施加这种影响的?

(2)依据材料二指出,20世纪60、70年代,联合国发生了什么变化?

(3)材料三体现了联合国的什么作用?请说明材料二中的变化与这种作用之间的关系。​