likely和likelihood的用法？

在prep中看到一道题目：

According to a new report by the surgeon general,
women with less than a high school education had three times the likelihood
that they would begin smoking as women who went to college.

(A) had three times the likelihood that they would
begin smoking

(B) had three times the likelihood of beginning
smoking

(C) were three times more likely to begin to smoke

(D) were three times more likely that they would
begin to smoke

(E) were three times as likely to begin smoking

E

请热心朋友给解释下likelihood  和likely 的用法

谢谢

According to a new report by the surgeon general, women with less than a high school education had three times the likelihood that they would begin smoking
            as women who went to college.

这道题目根据未画线的as和平行就能马上判断出来E了。

关于likelihood  和likely ，一个是名词，一个形容词。

通常 be likely to do sth. 在ＧＭＡＴ是正确答案的多。

tossing a coin has the likelihood of come up head 1/2 of the time, and tail the rest of the time.

likelihood of.  but other than probability and estimation, likelihood is not used very often.

GAMC很少有用likelihood的题目。PREP里面有好几道关于likely和likelihood的题目可以参考。