GWD3-Q10:

Antarctica 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

Answer: B

C：and前后并列，be动词省略，用or else表示否则，为什么不对呢？

请NN们指点。谢谢！

这是一道争议题目。

1. is so reflective that little of the polar ice melts during the summer; were it to do so,  ==》 were it to do 不好，有人认为是虚拟预期
2. so reflective that little polar ice melts during the summer, or else  ==》 有人认为so 前面需要有 is 和前面形成并列。

我倾向于C，用google搜到的原文和C比较接近。

我好像选了a，明显错了。

不过看了讨论决定b更好。原因：1. so...and so...平行

                             2. 后面出现would,所以用were it to do so, if it were to do so的省略形式,表示虚拟。

C我认为错的原因是 and前后的系动词不一样，前面是are后面是is，所以不能省略后者。。即使and前后系动词一样，也不能省略吧？

如果不选C 应该选谁呢