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题库 / GMATLA-SC-33
Unlike mainstream American businesses, more than half of which fail, the failure rate for businesses in the Amish community hovers around 5 percent.
Unlike mainstream American businesses, more than half of which fail
Unlike mainstream American businesses, in which the failure rate is more than half
Unlike mainstream American businesses, where more than half of them fail
While the rate of mainstream American businesses failing is more than half
While more than half of mainstream American businesses fail
题目分析：
略。
选项分析：
A选项：Unlike身后是商业（mainstream American businesses），而其主句的主语是失败率（the failure rate for businesses），两者不可比。
B选项：比较错误同选项(A)。
C选项：比较错误同选项(A)。
D选项：本选项的错误在于表语上，因为选项的主语是rate，是一个比率，而表语是half，在逻辑上比率只能是50%（50percent）而不能是一半，即，我们可以说：
the rate of mainstream American businesses failing is 50%.
但不能说：
the rate of mainstream American businesses failing is half.
E选项：Correct. 本选项在语法和逻辑上均是正确的。
注意比较对象平行
Dthe rate of mainstream American businesses failing
应该用fail的从句来表示 failling 在这里是主要的 核心意思
while 后面不需要对称性，答案D 意思是the rate is more than 一半，但是rate应该跟50%对比，而E的意思要更明显。
在逻辑上比率是一个数，只能是50%（50percent）而不能是一半，即，我们可以说：
the rate of mainstream American businesses failing is 50%.
但不能说：
the rate of mainstream American businesses failing is half.
rate不能half
rate不能half
D，While the rate of mainstream American businesses's failure is more than half
the rate of mainstream American businesses failing的意思是，主流美国企业的比率，failing做定语修饰企业，应该是失败比率，而不是企业的比率；失败率是可统计的，失败的企业不可以统计（如何定义失败的企业？这次失败了，下次还会成功，那么它是失败企业还是成功企业呢？）
the rate of mainstream American businesses failing is 50%.
但不能说：
the rate of mainstream American businesses failing is half.
另外while表对比时，前后不需要严格对称