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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. | |
| to be huge reservoirs of energy, possibly causing sea floor instability, and | | |
| to be huge reservoirs of energy, possibly causing sea floor instability, and even as | | |
| as huge reservoirs of energy, possibly causing sea floor instability, and | | |
| as huge reservoirs of energy, and the possible cause of sea floor instability, | | |
| as huge reservoirs of energy, as possible causes of sea floor instability, and even as |
A和C如何比？就是as 和to be。答案是A 谢谢！
[此贴子已经被作者于2007-9-7 9:49:12编辑过] | 
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发表于 2007-9-7 09:48:00
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