请教一个SC题目。

1.Gas hydrate,chemical compoumds of water and natural gas,are increasingly being studied for their potential to be huge reservoirs of energy,possibly causing sea floor instability,and significant contribitors to gloabal warming.

A to be huge reservoirs of energy ,possibly causing sea floor  instability, and

E as huge reservoirs of energy, as possible cause of sea floor instablity, and even as

答案是A，我觉得选E，理由有三，Eas...as...even as平行，名词>Ving，且好像as>to be?请NN赐教。

这是什么上面的题呀，

我觉得SC还是OG和PREP比较好，有标准答案。

in A

"possibly causing sea floor  instability" doesn't comply to the systemic defination by nouns, huge reservoirs and significant contribitors.

vote for E

Some answers in GWD are incorrect in GMATPREP

oh? how comes?

any indication illuminates on this point that Gas hydrate's potential to be huge reservoirs of energy will possibly cause sea floor instability ?

Any relation?

it's unnecessary to express your sneer in the discussion.

Anyway, in your understanding as "sea floor instability和gloabal warming是huge reservoirs of energy导致的,而不是Gas hydrate导致的", A should be wirtten as the following: 

 "to be huge reservoirs of energy ,possibly causing sea floor  instability and gloabal warming" rather than the original sentence: "significant contribitors to gloabal warming"

yes, that's your point:

- parallelism structure between huge reservoirs  and significant contribitors

- huge reservation energy causes sea floor instability

en....good explaination for A