1.如果一下很难区分比较对象是否正确，可以根据这个技巧：compared with/compared to是用来修饰之前这个statistic的，因而compared with/compared to要紧跟另一个statistic（在极少数的情况下可能不会紧跟，这个时候对比选项，选最近的）
43% of the xxxxx are hispanic, compared to 35% a decade ago.
2.compared with/compared to是一样的
（Basically, you should just know two things about \"compared to/with\".）
两个并列分句中，当谓语动词为系动词或者become时，后面一句一定要省略。并且and一并省略。
还原倒装：Frances Perkins' investigations of the garment industry were so dogged, her lobbying for wage
and hour reform (was) so persistent, that Alfred E. Smith and Franklin D. Roosevelt recruited Perkins to
work within the government, rather than as a social worker.
A. the numbers指代不清
B. Correct；came off作过去分词修饰trucks；that number指代前面总和的469000，如果是the number，没有指代对象，似乎说是the number of trucks。
C. the number指代不清；且alone比by themselves好，句意为强调"单单是卡车就有那么多了", 而不是强调"卡车它们自己怎么怎么样"，所以不用themselves。
D. twice结构不完整，少一个as，by themselves错误同C。
E. 错误同D。
补充说明
倍数表达方法总结：
"A + be + 倍数 + as + 计量形容词原级 + as + B
"A + be + 倍数 + 计量形容词比较级 + than + B"
"A + be + 倍数 + the + 计量名词 + of + B"
这道题说的是，实践中发现fractures that had initially been judged stable were found to have healed correctly，所以follow-up x-rays 是没用的。但此处的疑问就是，真的是所有的fractures that had initially been judged stable 都长好了、再没出现过异常情况吗？
C答案直译就是“在不同医院工作的医生的病人都X光都被review过了”正是在fix题干中的这个weakness，意思是说，“fractures that had initially been judged stable were found to have healed correctly”是在总结了许多医院的不同的医生的病例后下的结论，从统计意义上讲是有代表性的，所以确实是没有必要再开X光的。
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抄写了错误的数字浪费了我很多时间，考试要注意！