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

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题目分析：
略

选项分析：

A选项： Correct. 本选项在语法和逻辑上均是正确的。

B选项：主句的谓语动词是moderate，这使得未划线部分的and giving没有平行对象。

C选项：by moderating没有平行对象。

D选项：and giving没有平行对象。

E选项：and giving没有平行对象。

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