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.
(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
答案是b是固定搭配，但我有个问题，b是同级比较，在刘振民的语法改错精解中这种as...as的同级比较应该是as+adj+a/an+n+as 为什么这里不是 as little a risk as one chance in a million of causing .....??
彻底晕了，因为这个把b给排除了，请大家帮帮忙~>< | 
