题干

老年痴呆症患者的脑血管中有一种特殊的β一淀粉样蛋白体,它的逐渐积累可能导致神经元损伤和免疫功能下降。某些基因的突变会导致β一淀粉样蛋白体的产生和积累。下列技术不能用于老年痴呆症治疗的是(  )

A:基因治疗技术

B:胚胎干细胞技术

C:单克隆抗体技术

D:胚胎移植技术

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答案(点此获取答案解析)

D

同类题1

阅读下面的文章,完成小题。
卖面包的小女孩
马海霞
    我被护士领着准备去八楼手术。病房门口,一位小女孩把两大袋面包放在地上,弯腰,然后目视大家,伸出了三个手指,示意她的面包三元一个。老公忙掏出二十元钱递给小女孩,然后让她取六个面包放在我的病床上,临出门那一刻,他又对同病房的人说:“这孩子可能不会讲话,大家帮帮她,买点她的面包吧。”我第二天清醒后,老公见我已无大碍,便给我雇了个护工,然后去公司打理业务去了。
    下午,病房门被推开,那个卖面包的小女孩又来了,依旧提着两大袋面包,弯腰然后目视大家,这次她没有打哑语,而是用极低的声音吐出几个字:“帮帮我吧。”
    哎哟,原来她会说话!那昨天干嘛打哑语欺骗大家消费?这孩子心术不正,装可怜让大家买她的面包,哼,骗人只能骗一次,坚决不再上当。
    她没有离开,依旧呆站在原地,行弯腰礼,目光扫过病房里的每个人,楚楚可怜的模样里掺杂着一股不卖掉面包绝不离开的“黏人”劲儿,让人甚是讨厌。五分钟后,她提着袋子弯腰退出了病房。
    第二天,我能下地自己走动了,下午病房门被推开,那个卖面包的小女孩又来了,“帮帮我吧。”说完便立在原地,不待够五分钟她是不会离开的,但大家这次都懒得和她对话,把她当空气是对她最大的冷遇。我看不下去了,走到她面前说:“大家不想买面包,你待多久也没用,做生意最忌讳强行推销的。”她仿佛没有听见我的话,还呆立在那里,“好个倔丫头,你越这样,我们越不买。”她退出病房后,大家一致这样决定。
    以后的每天下午,小女孩准时光顾病房,她一进病房,大家就假装睡觉,连看都不看她,但也有病房里的人脾气不好,会把她赶出病房,“嘭”的一声把她关在病房门外。
    这天,老公一早赶来,我和他说起卖面包的小女孩的事情,他竟勃然大怒,对我一顿数落,说我心理阴暗,小女孩只是用自己的方式推销面包而已,她没有乞讨,她的行为不是欺骗,三元一个面包不贵,她卖的面包味道也不错,只是在病房里多待几分钟而已,不买也就罢了,你怎么能够去讽刺她,赶她走……我不想跟他在这件事上无休止地争辩,偷偷把他兜里的钱都没收了,哼,等下午那个小女孩再来卖面包,我看他用什么买。
    整整一天,病房里都没出现小女孩的身影,第二天,第三天,她一直都没来,我想,是不是我那句话刺激或伤到她了?
    我悄悄问护士,那个卖面包的小女孩咋没有来?护士告诉我,小女孩患有哮喘和先天性脊柱弯曲,冬天天冷风硬,极易引发她的哮喘病发作,医院知道她的情况特许她在病房里卖面包,为了不影响到患者休息,规定她一个病房最多只能停留五分钟。
    “那她这几天怎么没来?”我怯生生地问。
    “这几天天冷,肯定是哮喘病犯了。”
    “那她应该进病房走一圈,没人买就赶紧离开,也好早点回家呀。”
    “她智商不高,让她最多停留五分钟,她就停留五分钟,不管人家买不买,或许她觉得在规定的时间内努力推销她的面包,心里才坦然。”
    老公帮我办完出院手续。我说:“想给那个卖面包的小女孩留封信。”我把信交给了护士,让她转交给小女孩,出了医院,老公问我信里写了啥,我说,什么都没写,就是把没收你的零花钱都塞到了信封里。
(选自《读者》2016年第11期,有改动)

同类题2

阅读理解

    It was a boring and dull afternoon.Olivia had to work on a project for school about invention with wheels.

    She couldn't think of any ideas.

    "What am I going to write,Eliza?"she asked her little sister.Eliza didn't answer.

    "I'm going to go for a bicycle ride.That will help me think."

    Eliza followed her.

    Go inside,Eliza.Tell Mom I'll be back soon."

    Eliza was an obedient four﹣year﹣old girl.She always listened to Olivia.

    "Be a good girl,Eliza."Olivia closed the gate and rode away.She didn't see the gate swing(摇摆) open behind her.

    Olivia went riding fast down the hill from her house.It was exciting to move so quickly.She was slowing down to make a turn when she saw someone behind her.

    "Eliza!You are following me the whole time!You didn't listen!And I must have forgotten to lock the gate!"

    Then she saw that Eliza was crying and walking difficultly with a wounded knee.

    "I fell down,"said Eliza."My knee hurts!""Oh,no!You won't be able to get up that hill!"

    Olivia knew it was foolish to leave her sister alone outside.What were they going to do?Olivia started to get scared,but she knew she must be brave and find a way to get home.Then she saw an old wooden carriage by the path.The carriage was so old that it was broken when she picked it up,but the four metal wheels and two axles (车轴) were still strong.Then she found an old straw mat (垫子) and some strong wire.She tied the mat between the two axles with the wire.Then she tied the new cart to the back of her bike seat.

    "Come on,Eliza!Get on the cart."

    Olivia got on her bicycle and started to ride.It was hard to get up the hill,but she decided to get home.Finally,they arrived.

    "We're home,"said Olivia."And I have an idea for my wheel project.I'm going to write about my new invention﹣a little sister carrier!"