In a certain country, individuals tend to change their political affiliation readily from one political party to another. In the

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问题     In a certain country, individuals tend to change their political affiliation readily from one political party to another. In the past the Union party grew larger because of this tendency, but although most of those who change to a new party affiliation change to the Union party, the Union party has remained about the same size in recent years.
    Which of the following, if true, best helps to explain the change in the growth pattern of the Union party mentioned above?

选项 A、The economy has been prospering recently, and many of those who change party affiliation are upwardly mobile and prosperous.
B、In recent years those who were previously nonaffiliated have tended to join the Union party if they joined any party at all.
C、The percentage of voting-age citizens who change political party affiliation each year has remained constant, and the number of voting-age citizens has remained the same.
D、The percentage of voting-age citizens who are affiliated with any political party has increased over the last ten years.
E、Many members of the Union party have abandoned all political party affiliation in recent years.

答案E

解析 很多人会加入联邦党,同时根据该选项又会有很多人离开,因此导致联邦党规模不变,可以解释原文。E正确。A项说明改变政治立场的好处很多,联邦党应该越来越壮大才对,无法解释原文,不选。B项只能说明联邦党应该越来越壮大,无法解释原文,不选。C项公民的数量每年不变,改变政治立场的人的百分比也不变,因此每年改变政治立场的人数也不变。根据原文,只要改变了政治立场,大多数人会加入联邦党,那么这些年下来,联邦党还是应该越来越壮大。该选项没有考虑到就算每年改变政治立场的人数不变,但是加入联邦党的人数会逐年累加,不选。D项只讨论了百分比的变化,没有提及公民的基数,因此无法判断改变政治立场的人数的具体变化,不选。
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