[A] the continuing acquisition.

　　[B] the growing traffic

　　[C] the cheering Wall Street.

　　[D] the shrinking market.

　　[第51题答案及题解页数] C 第页

　　[第52题答案及题解页数] D 第页

　　[第53题答案及题解页数] C 第页

　　[第54题答案及题解页数] B 第页

　　[第55题答案及题解页数] A 第页

　　[长难句突破]

　　Shippers who feel they are being overcharged have the right to appeal to the federal government's Surface Transportation Board for rate relief, but the process is expensive, time consuming, and will work only in truly extreme cases.

　　主体句式：Shippers have the right to...but the process is…

　　结构分析：这个句子由两个包含转折关系的并列短句组成，由but连接。前半句中需要注意的是主语shippers后面“who feel they are being overcharged”是一个定语从句，不能将其误认为是主句。而后半句结构比较清晰，由三个并列的部分组成。

　　If railroads charged all customers the same average rate, they argue, shippers who have the option of switching to trucks or other forms of transportation would do so, leaving remaining customers to shoulder the cost of keeping up the line.

　　主体句式：They argue…

　　结构分析：这个句子比较具有迷惑性，其实全句的主句就是前面两个逗号之间的they argue。其实可以把这个句型修改为They argue that，句子中其他的内容都是由that引导的宾语的内容。宾语从句中首先是一个if引导的条件状语从句，紧跟的主句结构是shippers would to so，“who have the option of switching to trucks or other forms of transportation”是描述shipper特征的一个宾语从句，最后一个现在分词引导的伴随状态对前文起到补充说明的作用。

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