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3.When kids in parts of the world want to play,they often make soccer balls out of trash tied together with string."(48)Because   the areas used for playing fields are often rough and rocky,millions of real balls go flat (变瘪)(49)within   24 hours,"says Tim Jahnigen,a California businessman.Determined to solve this problem,(50)he    created an indestructible ball called the One World Futbol.
    The ball is made of (51)a   special material,ethylene-vinyl acetate foam.It's lightweight,it's flexible,and-(52)most   important-it holds its shape.
    The One World Futbol needs no pump(53)and   won't wear out,even on rough surfaces.When tested,(54)it    
withstood (经受住) being crushed by a car,and even being chewed on by a lion.
    Although it costs more to produce(55)thana typical soccer ball,Jahnigen estimates the One World Futbol can last 30 years.So far,it's been given to kids in 143 countries.

分析 本文是一篇说明文,文章主要介绍了一种既耐用,又轻巧灵活且不变形的足球.这种足球是由乙烯醋酸乙烯酯制成的,不易磨损.经测试能经受住汽车碾压和一头狮子啃咬.虽然它的成本比较高,但能用30年,到目前为止,已在143个国家被使用.

解答 48.because   考查连词.根据语境可知,因为用于运动的场地通常是高低不平的多岩石的,所以成千上万的真正的球会在24小时内变瘪.此处用because引导原因状语从句与上文构成因果关系.
49.within       考查介词.此处表示"在24小时内",故用within"在…之内".
50.he        考查代词.根据语境可知,他决定解决这个问题,发明了一种无法破坏的球,称之为"同一个世界足球".此处用he指代上文提到的Tim Jahnigen,一个加拿大的商人.
51.a         考查代词.根据语境可知,这种球是用一种特殊的材料做成的.此处泛指一种特殊的材料,故用不定冠词a.
52.most    考查形容词最高级.根据语境可知,这种球很轻,很灵活,最重要的是它能保持形状.此处用most.
53.and     考查名词.根据语境可知,这种世界足球不需要打气,甚至在高低不平的表面也不会磨破.此处需用并列连词and.
54.it       考查代词.根据语境和关键信息"When tested"可知,此处表示这种足球被测试时,故用it指代上文提到的"the One World Futbol".
55.than    考查连词.尽管这种足球花费比一般的足球高,但是Jahnigen推断这种球能够用30年.根据语境和上文中的比较级more可知,此处用than.

点评 解答此类题目应先浏览全文,概括大意,再根据句子间的提示以及括号内的汉语提示或首字母提示,依据语法规则和行为逻辑来推测并填写合适的词.

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