求解GWD-3-10! 正确选项句意不太明白。。

matchMichelle

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

不太明白正确选项中的B，后面那个虚拟语气were it to do，“it”指什么？？

marque

OA: B
were it to do so= if it were to do so, 含义：“如果是这样”
句义就变成： 冰层可以反射太阳光减少冰的融化，如果是这样，那么海平面上升，城市被淹。
这不是很诡异的一件事情吗？？ 我觉得这里应该放 “否则”之类的词语吧？

同问NN