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题库 / Prep2007E2-SC-9
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.
as little risk as one in a million chances to cause
as little risk as one chance in a million of causing
as little risk as one chance in a million that it will cause
a risk as little as one chance in a million for causing
a risk as little as one chance in a million for it to cause
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1-首先 as...as 结构，可以排除DE；
2-C that 后面有完整句子结构，到底是个定从还是怎么回事，定从it要省去，这个结构就有问题，还要看it 指代有歧义，排除C
3-AB里面就看定语用to do 还是doing, 这里to do和doing做定语成分，修饰Chance。 判断方法是看变化成分的主句的发生对变化成分的影响强弱与否，主句是“表现出风险-那种百万分之一导致癌症的可能性” 较弱，应该用ing，选B
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