The world is not only hungry.it will also be thirsty for water．About 97% of water on the earth issea water.or salt water．Man can only drink or use the other 3% of the fresh water which comes from ri 题目和参考答案——青夏教育精英家教网—

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3．The world is not only hungry，it will also be thirsty for water．About 97% of water on the earth is
sea water，or salt water．Man can only drink or use the other 3% of the fresh water which comes from rivers，lakes and underground．On the other hand，because the number of people in the world is becoming larger and larger，more and more fresh water is needed．So water shortage（短缺） becomes a big problem．
How can we work out this problem？Scientists have found some ways to turn salt water into fresh water．One important way is to boil（使达到沸点） sea water with high heat until vapor（蒸汽） rises，leaving the salt．In this way，a lot of fresh water can be made quickly．
But heating is not the only way to get fresh water．Other ways are tried，for example，digging deep wells，keeping rain water and stopping rivers from becoming dirty．
Which way is the best？To get the most fresh water for the least money is the best．

51．This passage mainly tells us fresh waterD．
A．only comes from the rain
B．can be used in many ways
C．can be found in many factories
D．is needed by more and more people
52．Which of the following is true according to the passage？D
A．Hunger is the only problem in our world．
B．Water shortage is the only problem in our world．
C．Scientists don't want to spend money solving the water problem．
D．Scientists have been working hard and have found some ways of solving the water problem．
53．The best title of this passage isC．
A．The Ways of Getting Fresh Water
B．How to Use Fresh Water in Our Daily Life
C．The Importance of Saving Water
D．Different Ways of Making Water in Different Places．

分析文章大意：主要描述了地球上的淡水资源匮乏，如何解决这一问题呢？科学想出了几种方法，海水淡化、保存雨水等．

解答 51-53：DDC
51题答案：D 主旨题，根据文中的第二段On the other hand，because the number of people in the world is becoming larger and larger，more and more fresh water is needed．So water shortage（短缺） becomes a big problem．我们对淡水的需求越来越大越来越快，几乎一天比一天更急切．我们现在应该采取措施来处理这个问题，只有这样，我们才有可能避免全世界范围的严重的缺水缺水危机．可知越来越多的人需要水，故答案是D．
52题答案：D 考查细节理解题，根据文中的第三段Scientists have found some ways to turn salt water into fresh water可知科学家想了很多方法，故答案是D．
53题答案：C 主旨题，根据文章大意：主要描述了地球上的淡水资源匮乏，如何解决这一问题呢？科学想出了几种方法，海水淡化、保存雨水等，可知标题应该是节约用水的重要性，故答案是C．

点评本文是一篇日常生活类阅读，题目涉及多道细节理解题，做题时结合原文和题目有针对性找出相关语句进行仔细分析，结合选项选出正确答案．推理判断也是要在抓住关键句子的基础上合理的分析才能得出正确的答案．

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