阅读理解If you're training for a marathon , a proper plan for water intake (摄入)

题文

阅读理解If you're training for a marathon , a proper plan for water intake (摄入) is important . Of cour , there'sthe risk of dehydration (脱水) . But athletes now know they can also get into trouble by drinking to much .To much water intake can lower levels of sodium (钠) in the blood . The death of a 28-year-old womanfollowing the Boston Marathon caught the attention of many runners and led to new rearch . Experts advi long distance runners to replace the liquids they sweat out . Their goal is to try to keep someone from not getting dehydrated by more than 2 percent of their body weight . One technique for deciding how much water you need is to get the exact numbers . Runners have to weight themlves before and after a run to determine how much water they've lost . If their weight drops by more than 2 percent , they have not drunk enough water. Hyponatremia occurs when runners drink so much water that blood salt levels drop off . A study published last year tested 488 runners who completed the Boston Marathon and found 13 percent of themhad dangerously low blood salt levels . The first sign that runners may notice is slightly swelling in the hands . They can't get their rings off , and then they might feel sick . They may not remember where theyare . In fact , most runners get enough salt to get back to normal levels by eating just one meal after a run .Contrary to the old advice that runners should drink as much as they can to prevent dehydration , the newrearch has shown that the body is a remarkable machine that actually tells you via thirst when you need water .1．The author of this passage is primarily concerned with.A．the signs and treatment for dehydration B．the long distance runners who need help C．how to manage water intake during a marathon D．a 28-year-old woman who died after a Boston Marathon 2．Why do runners have to weigh themlves before and after a run ?A．They can improve their performance in a run .B．They can learn how much salt there is in the blood .C．They ca know the quantity of water they've lost during a run .D．They can decide what kind of water they should take during a run .3．What conclusion can we draw from the passage ?A．Taking much salt during a run can avoid lling in the body .B．Either too much or to little of water intake is harmful .C．A rich meal is helpful to our performance in a run .D．We should take enough salt during a run .4．According the passage, which of the following statements is correct ?A．Too much water intake→blood sodium levels ?→dehydration .B．Too much water intake→blood salt levels ?→hyponatremia .C．No water intake→blood sodium levels↑→hyponatremia .D．No water intake →blood salt levels ?→hyponatrenmia . 题型：未知难度：其他题型

答案

1-4. CCBB

解析

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   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。