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.
A. is reflective, so that little polar ice melts during the summer; otherwise,
B. is so reflective that little of the polar ice melts during the summer; were it to do so,
C. so reflective that little polar ice melts during the summer, or else
D. reflective, so that little of the polar ice melts during the summer, or
E. reflects so that little of the polar ice melts during the summer; if it did
正确选项是B
可是the temperatures are so cold 和the ice cap is so reflective 不是两个句子的并列么？两个句子并列，若第一个句子中有be 或become，则第二个句子中必须省略不是么？那这里为什么cap后面的is不省略呢？
还是说，这里是因为 so that 句型的关系，is就不能省略了？
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