问题 探究题

法国科学家巴斯德在研究家畜的炭疽时,利用绵羊进行了一项著名的实验,实验的方法和过程如下表所示:

 第一次处理第二次处理
方法结果方法结果
甲组绵羊注射脱毒病菌没有患炭疽注射强毒病菌没有患炭疽
乙组绵羊不注射脱毒病菌没有患炭疽注射强毒病菌患炭疽
 

请分析回答:(3分)

(1)甲组绵羊第二次注射后没有发病,是因为_______。

(2)乙组绵羊在实验中的作用是_______。

(3)为防止炭疽在人群中流行,美国卫生部门加强了对邮件等物品的检疫,从预防传染病的角度分析,采取的这一措施属于_______。

答案

(1)第一次处理后,体内已产生了抗体   (2)对照   (3)切断传播途径

甲组绵羊因为经过第一次处理后,体内产生了抗体,所以注射强毒病菌时,不会换炭疽,乙组是对照组,甲组是实验组,加强了对邮件等物品的检疫,切断了病原体离开传染源到达健康人所经过的途径,该措施属于切断传播途径。

阅读理解

要想成为最有吸引力的人,要注意生活中一些简单的细节。阅读下面六个有关如何成为最有吸引力的人的方法的描写,选出符合题中五个标题的选项,并在答题卡上将相应的选项的标号涂黑。选项中有一项多余选项。

_____1 Ask lots of questions

_____ 2. Great posture

_____ 3. Stay busy

_____ 4. Show your pearly whites ( or just smile)

_____5. Be interested in other persons

A.Don’t talk about yourself … remove attention from yourself. If you are interested in other persons, it will be helpful. And if you want to talk about yourself, you'll find that putting the other person first actually opens him up to return the favor and ask you questions. See how fun this is?

B.In other words, be humble. If you are a know-it-all (even if you really do know it all!), it really pushes people away. Rather, asking lots and lots of questions makes people feel like you care, you can be trusted, and you are... humble.

C.Walk like you know where you're going, and do so with good posture. Walk like you'll run over anyone who even attempts to hassle you. If you walk like this, you'll be spotted from a mile away.

D.Smile more, no matter how ugly your teeth are. I'm not kidding about this one. It's not all about the teeth. If you are smiling genuinely, you can draw everyone for 100 meters around to you.E. Perhaps you have seen someone who perhaps could be quite ugly but they have great posture and so suddenly they are really attractive? It's true. Your posture says a lot about you -- it says whether you have confidence, or simply if you really care. Talking physically, it is one of the most important physical characteristics you need !

F. Do you really know the power of this? We're told to stay busy to break away from  depression and feelings of anxiety. But did you know you should also stay busy to be really attractive? It's true. Always have something to do. Have you ever seen someone just sitting around, doing nothing? How unattractive. Always be busy with something, even if for some reason you have to make something up.