题干

手足口病是由肠道病毒(EV71)引起的一种传染病.5岁以下儿童容易感染此病,患者的症为手、足和口腔等部位出现疱疹(如图所示).病毒寄生在患儿的咽部、唾液和粪便中,不仅可通过唾液、喷嚏、说话时的飞沫传染给别人,还可通过生活用品及餐具等间接传染。

(1)引起手足口病的肠道病毒(EV71)是____ (填“病原体”或“传染源”).该病毒没有细胞结构,由____ 外壳和内部的遗传物质组成。

(2)患过手足口病的人不易再感染肠道病毒(EV71),这是因为人体产生了一种特殊蛋白质的叫____ (“抗原”或“抗体”).从免疫角度讲,机体获得了____ 性免疫。

(3)手足口病是传染病,具有传染性和____ 性的特点,请你写出一条预防措施____

上一题 下一题 0.0难度 选择题 更新时间:2018-03-20 12:35:38

答案(点此获取答案解析)

病原体,蛋白质,抗体,特异,流行,水源、厕所、生活用品及餐具等喷洒消毒药

同类题1

阅读理解

    Traveling by bicycle is a very popular means of transportation throughout China. China has a huge population, and it is said that there is at least one bicycle for every two people within the country. Of course, many people in China ride bicycles purely for sport or exercise, but it's also a much more commonly accepted means of everyday transportation, as compared to countries such as the United States.

    If you are living for a long period of time in China, chances are you will want to purchase your own bicycle so that you can use it whenever you want for transportation or just for the enjoyment of riding. Even if you don't use a bicycle for everyday transportation, owning one can be a great way of enjoying some of the trails in the rural areas, just for fun. However, if you are just visiting China, renting a bicycle can be a more convenient choice.

    It is important to choose the correct bicycle for your use. You'll find that in China, the one-speed style of bicycle is extremely popular. These bicycles are great if you want to ride around in the city to see the sights. They are quite comfortable and easy to ride. You can often rent a bicycle for an entire day for around $15.

    However, if you wish to ride on some of the rural paths, a mountain bike style would be a better choice. They are great for different kinds of road surfaces, providing for a safer ride. If you are planning to have a desire to tour and still be able to carry packages with you, then a touring bike would be the best choice. These are generally the most expensive to rent, but are extremely handy for carrying packages and even some of your luggage along with you.

同类题5

阅读《________:全面了解胡萝卜》一文,完成第小题。

    ①曾有人预言下一个改变世界的技术不是大数据,不是人工智能,而是基因组测序。它不仅可以让我们了解生物的本源,还能够让我们更好地对生命进行“改造”。甚至可以说,这项技术将影响并改变我们的生老病死。

    ②胡萝卜和生菜、芹菜属于植物中的一大类,但它质脆味美,更受大部分家庭主妇青睐。胡萝卜栽培广泛,其根部富含营养物质,如胡萝卜素和多种维生素等,是世界各国饮食中的重要组成部分。

    ③美国威斯康辛大学麦迪逊 分校的菲利普•西蒙和他的研究团队完成了对30余种胡萝卜样品的基因测序,绘制出了胡萝卜基因组序列草图。这很可能是迄今最完整的蔬菜基因组序列草图,相关论文在线发表在《自然•遗传学》杂志网站上。

    ④菲利普•西蒙和他的研究团队使用一根胡萝卜的DNA组装了一个高质量的参照基因组,确认了胡萝卜共有32113个基因,其中有10530个基因是胡萝卜特有的。而后,他们对包括野生种和栽培种在内的35个不同品种的胡萝卜样品和亚种进行了测序。研究人员称,这一研究不仅使我们比以往任何时候都了解胡萝卜的所有营养物质和组成成分,而且阐明了胡萝卜的起源和演化过程。他们把胡萝卜的基因组序列和其他植物进行了比较,来确认在进化道路上,胡萝卜的祖先究竟是何时与葡萄、猕猴桃以及西红柿“分道扬镳”的。

    ⑤此外,他们在胡萝卜根部发现了一个负责积累维生素A前体的基因,正是这个基因让胡萝卜积累起特别多的β胡萝卜素。研究人员表示,这一研究为改善胡萝卜和其他农作物的营养价值提供了可能,不仅能够帮助胡萝卜育种者改善胡萝卜的口感和营养价值,未来还有望让其他农作物具备胡萝卜的“特长”,使口味更好,更有营养。

(选自2016年5月12日《科技日报》,有删改)