27. Care should be taken to decrease the length of time that one is ________ loud continuous noise.
    
    [A] subjected to [B] filled with [C] associated with [D] dropped off
    
    正确答案是(A)
    
    题目分析：(A)(be)subjected to : "遭受，受到，服从"。 (B)(be ) filled with : "充满了"。(C)(be) associated with: "与……联系在一起"。(D)(be) attached to："附属于，依恋于"。显然是(A)"遭受到极大的不断的噪声"为最合理。
    
    28. Some of the most important concepts in physics ________their success to these mathematical systems.
    
    [A] oblige [B]owe [C]contribute [D]valuable
    
    正确答案是(B)
    
    题目分析：(A)oblige ...(to do)："强迫……做某事"。Oblige还有“施惠；帮…的忙”的含义，例如：Please oblige me by closing the door.请帮我把门关上。I'm much obliged to you.我非常感谢你帮忙。这一用法是2004年考研英语翻译第62题的一个重要考点。(B)owe ....(to )："多亏，感谢，把…归功于"。(C)contribute...(to)："献出，把……花费在……"，contribute to导致，造成。(D)attribute...(to)："把……归属于……"。显然，(B)为正确答案。这句话的意思为：一些物理学中最重要的概念的成功应该归功于这些数学体系。而不能把物理学中概念的成功"归属于"数学体系。
    
    29. As your instructor advised, you ought to spend your time on something __________ researching into.
    
    [A] precious [B] worth [C] worthy [D] valuable
    
    正确答案是(B)
    
    题目分析：(A) precious："宝贵的；完全的"。(B)worth："值得的"。worth后面一般跟动名词表示"值得做某事"，并且用主动形式表达被动的含义，而(C)worthy也表示"值得做某事"时，一般的用法是worthy of sth.或worthy to be done。此外，worthy有受人尊敬的意思，这一含义，在2006年考研阅读理解第二篇文章第二段从到了这一含义，“the worthy residents”. (D)valuable："有价值的，贵重的"，比较词义和用法，(B)为最佳答案。
    
    30. As a defense against air-pollution damage, many plants and animals _________ a substance to absorb harmful chemicals.
    
    [A] relieve [B] release [C] dismiss [D] discard
    
    正确答案是(B)
    
    题目分析：(A) relieve："减轻, 解除, 援救, 救济"。(B)release："释放；免除；发行，发布"。(C)dismiss"解散；解雇；消除"。(D)discard:"抛弃，解雇"。此题目意思是：作为对空气污染的防护措施，许多植物和动物释放出一种可以吸收有害化学成分的物质。因此应选择(B)。against是1998年完形填空的43题的考点。
    
    31. Without the friction between their feet and the ground, people would ________ be able to walk.
    
    [A] in no time [B] by all means [C] in no way [D]on any account
    
    正确答案是(C)
    
    题目分析：此题目考查介词和名词搭配的固定词组的含义。(A)in no time："立即，立刻"，=at once.(B)by all means："务必"。(C)in no way："不可能"。(D)on any account：“无论如何”，往往用于not on any account"决不"。根据题意(C)是正确答案。
    
    32. While typing, Helen has a habit of stopping ________ to give her long and flowing hair a smooth.
    
    [A] occasionally [B] simultaneously [C] eventually [D] promptly
    
    正确答案是(A)
    
    题目分析：(A) occasionally："偶尔，有时"。(B)simultaneously："同时"=at the same time。(C)eventually"最终，最后"，一般放在句首。(D)promptly："敏捷地，迅速地"。根据上下文，应选择(A)。上下文为：打字的时候，Helen习惯于偶尔停下来梳理她的长而飘逸的头发。 
    

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