求助2道语法题（so that相关）

求助2道语法题，哪位NN给讲讲so that 和so...that 有何区别，谢谢！

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

The four-million-year-old fossilized skeleton known as Lucy is so small compared with many other skeletons presumed to be of the same species, and so some paleontologists have argued that Lucy represents a different lineage.

A.      presumed to be of the same species, and so

B.       presumed to be of the same species that

C.      presumed that they are of the same species, and so

D.      that they have presumed to be of the same species, so that

E.       that they have presumed are of the same species, and

第一个是a？我也不是很确定，但是觉得其他都有问题。so that应用最广泛，而且没有具体形式

第二个是b，compared with many other skeletons presumed to be of the same species可以不看，就明白了