gwd5-1和gwd3-10两道so...that...题，请NN们指教

gwd5-1:

So dogged were Frances Perkins’ investigations of the garment industry, and her lobbying for wage and hour reform was persistent, Alfred E. Smith and Franklin D. Roosevelt recruited Perkins to work within the government, rather than as a social worker.and her lobbying for wage and hour reform was persistent,

LACE>gwd3-10LACE>

LACE>LACE>LACE>AntarcticaLACE> receives more solar radiation than does any other place on Earth, yet the temperatures are so cold and the ice cap is reflective, so that little polar ice melts during the summer; otherwise, the water levels of the oceans would rise 250 feet and engulf most of the world’s great cities.

1. is reflective, so that little polar ice melts during the summer; otherwise,
   
   
2. is so reflective that little of the polar ice melts during the summer; were it to do so,
   
   
3. so reflective that little polar ice melts during the summer, or else
   
   
4. reflective, so that little of the polar ice melts during the summer, or
   
5. reflects so that little of the polar ice melts during the summer; if it did

看了以前大家分别对这两题的讨论，虽然在一个帖子中有前辈也将它们放在一起进行比较并提问，但好像没有引起注意，现在我想把它们再翻出来重新比较一下，请NN们指教！

如果说gwd5-1这题选E没有太多争论了的话（曾经有人在考场上以身试法），那么我觉得gwd3-10的C选项可能比B选项好。因为从gwd5-1的E选项我们可以推知，be动词在单复数不同的情况下仍旧可以省略，那么在gwd3-10中的C选项，省略的单数的be动词也是可以接受的，而且在该题的C选项中or else是“否则”的意思，作用相当于连词，因此它表达的意思远比B选项的“were it to do so”来得清楚。请看Longman对or else的解释：

or else：used to say that there will be bad result if someone does not do something.

Hurry up or else we will miss the trains.

但我在以前的讨论中没有找到有关支持gwd3-10选C选项帖子，不知是前辈没有讨论过还是我没有找到，抑或是我的分析还有严重的缺陷导致错误的结论。Anyway，请NN们再次对这两题进行讨论吧。