13 Oberlin College in Ohio was a renegade institution at its 1833 founding for deciding to accept both men and women as students
b for the decision at its 1833 fouding to accept
c when it was founded in 1833 for its decision to accept
d in deciding at its founding in 1833 to accept
e by deciding at its founding in 1833 on the acceptance of
答案d
动词+不定式deciding to accept 中间能插入其他成分吗？
14 Unlike a hurricane, which can be obsered from within, a tornado is so small that such a study has not been practical.
e as to be impractical of study
答案a
e为什么不对， tornado be impractical of study可以成立呀？a里面的such用的没道理，前句并没有study出现。
记得such的用法，是同样的事物再次出现时，可用。想问一下，同样的事物是说前面一定要有一模一样的单词能，还是可以对它进行抽象的概括？
18 Even though the state has spent ten years an dseven million dollars planning a reseroir along the Ubi River, the project will have to be abandoned as a result of the river becoming so heavily polluted.
b is to be abondoned on account of the ehavy pollution which the river received
e must be abandoned because the river has become so heavily polluted
答案e
b是不是没有反映出have to的意思，所以不对？
13.in deciding at its founding in 1833 to accept
可以。at its founding in 1833 提前是为了强调。
14.so as to 的使用没有问题，但to be impractical of study的表达不符合规范，应用impractical for。such a study指代obsere the tornado from within，相当于such a study that a tornado can be obseved from within.
18.b is to be abondoned on account of the heavy pollution which the river received不对是因为
(1)which 引导的从句时态不对。应用has received.
(2)on account of 使用不对。主语是the project,而不是the state,不能用on account of.
