Whenkidsinpartsoftheworldwanttoplay，theyoftenmakesoccerballsoutoftrashtiedtogetherwithstring．“（48）theareasusedforplayingfieldsareoftenroughandrocky，millionsofrealballsgoflat（变瘪）（49）

Question

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

Answer 1

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．