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.
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
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
其实我一直都不是特别清楚to be和as用法的区别。不过这道题感觉上应该选择to be， A选项。
I agree with you. significant contributors to global warming 与 huge reservoirs of energy 并列.
例： critics of the trend privately operated prisons consider facilities an integral part of criminal justice system, and they question whether profits should be made from incarceration.
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发表于 2006-4-13 11:07:00
