Gas hydrates, chemical compounds 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 contributors to global warming.

A、to be huge reservoirs of energy, possibly causing sea floor instability, and
B、to be huge reservoirs of energy, possibly causing sea floor instability, and even as
C、as huge reservoirs of energy, possibly causing sea floor instability, and
D、as huge reservoirs of energy, and the possible cause of sea floor instability,
E、as huge reservoirs of energy, as possible causes of sea floor instability, and even as

答案：A

专业教师答疑

问题：如果要用and even as那么and之前就需要有个as连接的东西与之对应。所以排除B,E；possible cause of sea floor instability是修饰huge reservoirs of energy并不是并列关系，所以排除D,怎么区别AC的小词一个as，一个to be呢？查看答疑

问题：第一步读意思：GH是一种水和天然气的混合物，正在被越来越多的研究潜力，这个潜力是成为大的能量的R，可能引起海平面的不稳定，而且是全球变暖的主因。然后，发现明显的区别：AS，to be.觉得as作为，to be去成为，后者更好些排除CDE 但其实我看不懂“可能引起海平面的不稳定，而且是全球变暖的主因。”这半句的发起者是谁查看答疑

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