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题库 / OG2016-SC-66
Covering 71 percent of Earth's surface, the oceans play an essential role in maintaining the conditions for human existence on land, moderating temperature by the absorption of heat and carbon dioxide, and giving pure water back to the atmosphere through evaporation.
Covering 71 percent of Earth's surface, the oceans play an essential role in maintaining the conditions for human existence on land, moderating
Covering 71 percent of Earth's surface and playing an essential role in maintaining the conditions for human existence on land, the oceans moderate
The oceans cover 71 percent of Earth's surface and play an essential role in maintaining conditions for human existence on land, and by moderating
The oceans cover 71 percent of Earth's surface, play an essential role in maintaining the conditions for human existence on land, and moderate
The oceans cover 71 percent of Earth's surface, playing an essential role in maintaining the conditions for human existence on land, and they moderate
maintaining the conditions for human existence on land, moderating temperature by the absorption of heat and carbon dioxide和 giving pure water back to the atmosphere through evaporation都是作play an essential role的状语成分。逻辑上是一致的，都指在哪方面扮演了重要角色。所以应该平行。逻辑平行导致语义平行，所以先看逻辑。
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