EAlthough we already know a great deal about flu, and although the World Health

题文

EAlthough we already know a great deal about flu, and although the World Health Organization is constantly collecting detailed information from its chain of flu reference laboratories throughout the world, it is extremely difficult for epidemiologists, who study infectious dias, to predict when and where the next flu epidemic will occur, and how rious it will be. There are three kinds of flu virus, known as A, B and C. Flu C virus is relatively stable and caus mild infections that do not spread far through the population. The A and B types are unstable, and are responsible for the epidemics that cau frequent concern. Following any virus attack, the human body builds up antibodies （抗体） which can be changed into immunity to that type of virus but a virus with the ability to change its character is able to bypass this protection. Variability（可变性） is less developed in the flu B virus, which affects only human beings. Flu B virus may cau a widespread epidemic but will have little effect if introduced into the same community soon afterwards, since nearly everyone will have built up antibodies and will be immune. The flu A virus, which affects animals also, is extremely unstable and is responsible for some of the worst outbreaks of the dia, such as the world epidemic, of 1918 and 1919, when about half the world’s population were infected and about twenty million people died, some from pneumonia caud by the virus itlf and some from condary complication caud by bacteria. Accurate prediction is difficult becau of the complication of the factors. A particular virus may be related to one to which some of the population have partial involved immunity. The extent to which it will spread will depend on factors such as its own strength, or virulence （病毒性）, the ea with which it can be transmitted and the strength of the opposition it encounters （遇到）. Scientists, however, have a reliable general picture of the world situation. 72. Which of the following is the most appropriate title for the passage? A. Symptoms of Flu   B. Man VS Flu Virus C. WHO: The Major Organization against Flu Virus   D. Variability of Flu Virus 73. What does the author say about the flu B virus? A. B Virus is relatively stable and caus mild infections that do not spread far through the population. B. B Virus is unstable, and is responsible for the epidemics that cau frequent concern. C. B virus is extremely unstable and is responsible for some of the worst outbreaks of the dia. D. B virus has a very developed variability, and it affects only human beings. 74. Which of the following is NOT mentioned as a factor contributing to the extent to which a virus spreads?A. The strength of the virus.   B.The ea with which the virus can be transmitted. C. The strength of the opposition. D.The immunity the virus can bring about. 75. This article is quite probably ________.A. a piece of news    B. a special science reportC. an introduction to a dia     D. a scientific fiction  题型：未知难度：其他题型

答案

72 B  73 B  74 D  75B

解析

略

考点

据考高分专家说，试题“EAlthough we already.....”主要考查你对 [健康环保类阅读 ]考点的理解。 健康环保类阅读

健康环保累阅读概念：

健康环保类文章常是介绍科学知识、生活常识和环境保护方面的短文。体裁有记叙文、 说明文、议论文和各种应用文。

健康环保类文章阅读技巧：

   健康环保类文章常是介绍科学知识、生活常识和环境保护方面的短文。阅读此类短文要以现象或事物为中心进行思考，理解现象产生的原因、条件和客观规律等。同时要抓住事物的特征、用途和相互关系等。科普环保类文章一般为说明文，从结构上看大致可分为三个部分：   第一部分一般是文章的首段，主要用来提出文章的主题，即文章想要阐述、说明的主要内容；   第二部分是文章的主体，可由若干个段落组成，对文章的主题进行展开说明；   第三部分是结尾段，对文章的主题进行归纳总结。这类文章多用一般现在时，而且一般多使用客观性词语表述。有时为了强调客观性，也常使用被动语态。   从近几年的考试题来看，科普环保类的文章越来越与人们的实际生活相接近。由于此类文章缺乏故事情节，很多同学对此类文章感到费解。但一般的科普类文章都是就事论事，需要逻辑推理和想象的时候较少，因此此类阅读题也没有同学们想象中的那么难，只要多加训练，就能较好地答题。【阅读策略】 1、概要(Summarizing)：  阅完材料后，将所阅材料浓缩，摘要，做出所阅材料的书面或口头梗概。 2、组织(Organization)：  阅读后根据阅读内容，识别观点、人物、事件之间的关系以及文章的结构关系。如：时间关系、比较或对比关系、相关关系及因果关系等。