OG中的疑问，请XDJM帮帮忙，谢谢。

bob

1. The rising of costs of data-processing operations at many financial institutions has created a growing opportunity for independent companies to provide these services more efficiently and at lower cost.
A.        The rising of costs
B.        Rising costs
C.        The rising cost
D.        Because the rising cost
E.        Because of rising costs
2. New theories propose that catastrophic impacts of asteroids and comets may have caused reversals in the Earth's magnetic field, the onset of ice ages, splitting apart continents 80 million years ago, and great volcanic eruptions.
A.        splitting apart continents
B.        the splitting apart of continents
C.        split apart continents
D.        continents split apart
E.        continents that were split apart
3. In the mid-1960's a newly installed radar warning system mistook the rising of the moon as a massive missile attack by the Soviets.
A.        rising of the moon as a massive missile attack by the Soviets
B.        rising of the moon for a massive Soviet missile attack
C.        moon rising to a massive missile attack by the Soviets
D.        moon as it was rising for a massive Soviet missile attack
E.        rise of the moon as a massive Soviet missile attack
这是OG里面的三道题目，答案分别是CBB。
问题在于，第一题选A为什么不对？
          第二题选A为什么不对？如果A 改为the splitting apart continents或者the continents splitting apart，能不能选？？
        第三题，B改为rising moon for a massive Soviet missile attack是否仍然正确？？
对于，这类情况，到底是用DOING作中心词好，还是把DOING当作是形容词来修饰别的中心词好。
请教各位XDJM，先谢谢大家。

Louisa_xy

1.需要明确主语，主语应该是cost,而不是rising

2.the splitting apart of continents还是要比the splitting apart continents或者the continents splitting apart好。
the splitting apart of continents和其他词组平行，不仅是形式上的还有逻辑的平行：这几个平行短语的重心分别是reversals，onset，splitting apart和eruptions。

bob

Louisa_xy，厉害厉害。
非常感谢。

bob

Louisa_xy，但是，第一题，主语为rising我觉得逻辑上也说得通啊，而且好象更准确，就是这个“上升”导致了后面的结果，至少不能说“上升”做主语不对。想请教您，怎么样来权衡是用DOING还是用名词来做中心词。谢谢。

tongxun

是上升的COST导致的后面结果