请看这道妖题。
9. (24819-!-item-!-188;#058&001693)
The Environmental Protection Agency frequently puts mandatory controls on toxic substances that present as little risk as one in a million chances to cause cancer.
(A) as little risk as one in a million chances to cause
(B) as little risk as one chance in a million of causing
(C) as little risk as one chance in a million that it will cause
(D) a risk as little as one chance in a million for causing
(E) a risk as little as one chance in a million for it to cause
句子结构：The EPA puts controls on toxic substances that…
That引导定语从句修饰句子宾语substances。
考点：习惯用语、指代一致
1、 习惯用语-risk of doing sth, risk of sth（risk分别为名词）, risk doing（risk为动词）。
2、 指代一致，it只能指代句子中出现过的单数名词，注意未划线部分的提示。
(A) one指代risk，risk in a million chances表达错误；risk of doing是习惯用语。
(B) 正确，one chance in a million用以修饰little，risk of causing cancer是正确的表达方式。
(C) that it重复，前面已经有that present，it指代不清楚，无法指代复数名词toxic substances。
(D) risk后面应该跟of doing，而不是for doing。
(E) it指代不清楚；risk后面应该跟of doing，而不是to do。
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可是，正解当中的as little risk as one chance in a million of causing, 在as...as当中怎么夹着的是个名词，不是应该是形容词原级吗？？
另外，A为什错？one in a million chances和one chance in a million 之间有什么区别吗？
还有对语法笔记的一个质疑（蓝色），为什么这里的of doing 不是修饰更加靠近的chance?? chance 作“可能性”解，也有chance to do 和chance of doing.
请大家讨论下
刚才查了下One chance in a million有词组的，形容可能性之小。
EG：.She has only a chance in a million of getting the job.
她能得到那份工作的希望很渺茫。
谢谢楼上，我刚刚也看到例子了……脑子抽筋了，还停留在高中……
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