[SC悬赏令] prep 2012-59&prep 2012-60的so that用法问题

On the surface of Jupiter'smoon Europa, water remainsfrozen, but the gravitational force of Jupiterand its other moons cause contractions that may generateso much heat that it wouldmelt ice below Europa’ssurface.

A.     moons cause contractions that may generateso much heat that it would melt

B.     moons cause contractions, with enoughheat generated for melting

C.     moons causes contractions that may generate enough heat to melt

D.    moons, causing contractions, may generate so much heat to melt

E.     moons, which causes contractions, may generate enough heat for melting

Prep2012-Pack1-SC-060        VSC07626                                                 hard
A recording system was so secretly installed and operated in the Kennedy Oval Office that even TheodoreC. Sorensen, the WhiteHouse counsel, did not know it existed.
A.       A recordingsystem was sosecretly installedand operated in the KennedyOval Office that
B.       So secret was a recordingsystem installation and operation in the KennedyOval Office
C.       It was so secret that arecording system was installedand operated in the Kennedy Oval Office
D.       A recordingsystem that was so secretlyinstalled and operated in the KennedyOval Office
E.       Installed and operated so secretly in the KennedyOval was a recording system that

来，让我们先忽略59题A选项主谓不一致和would的用法问题，假设59的A选项变成这样：moons causes contractions that may generate so much heat that it will melt，我觉得说得通，但答案却说本选项中 heat melt ice 和 contractions generate heat 之间是相关关系（so that 引导的状 语从句），在逻辑上，如果我们不知道收缩力和融化冰的关系，那么“引力引起收缩力 （the gravitational force of Jupiter and its other moons causes contractions）”和“水保持静止（water remains frozen）”之间会无法产生转折关系。

再来看60题，答案说通读原句，我们知道，“一个记录系统在 the Kennedy Oval Office 的秘密建立和运营” 以及“Theodore C. Sorensen 不知道这个记录系统的存在”之间应该具有因果关系（so that）， 可以排除(B)(D)；(C)中的 so that 位置不对，放在此处使得 install 和 know两句之间缺少连词； (E)试图用倒装结构来表达，但是此处倒转结构有问题，应该是：so secretly installed and operated in the Kennedy Oval was a recording system that（完全倒装），排除(E)，答案为(A)。

不明白：为何在59题A选项中是相关关系，但在60题就是因果关系了？？