扫描二维码，直接登录
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
如果这样看待C选项，可以吗：play a role in maintaining... and play a role by moderating... and giving...
in maintain 和 by moderate并列，而give和moderate并列
后面的maintain the conditions, moderate temperature, give pure water back to atmosphere都是ocean的作用，和前面的ocean的状态cover 71 percent of Earth's surface在语义上不能混在一起。
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。
把句子看完在做题！！！1
moderating and giving平行
把句子看全！
考察：
未画线部分and giving的平行
逻辑上oceans play an essential role in maintaining the conditions for human existence作为主句，moderating temperature和giving pure water作为状语修饰主句作为play an essential role解释说明。三个动词里面moderating和giving应该要保持平行
B选项：ungrammatical; the oceans moderate...and giving...是一系列的动作，应该符合平行结构；
C选项：and by moderating...引起新句子，但是没谓语又构不成句子，同时也不符合平行结构；
D选项：and giving没有平行对象。
E选项：and giving没有平行对象。
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。
如果能一眼看出三者平行，这道题SO EASY就解决了
这里 covering必须做伴随吧，根据图像背景原理
选对了，但是对moderating做的成分有疑问，是伴随状语吗，所以它修饰的是不是land？
不是伴随～是三者的平行，maintaining，moderating，giving。
老师，这与你之前说的要怎么结合起来理解呢？
两个并列是成分用and连接时，and身前不能有逗号。例如，一般我们说：
(1) James and I went to New York.
我们不说：
(2) **James, and I went to New York.
当投资100刀和每年能挣2刀并列时，应该写为：
I invested $100, holding 3 share, and could earn $2 per year.
此时不能写为：
I invested $100, and I held 3 share and could earn $2 per year.
我是这样理解的哈：你引用的例句里面，James and I是主语并列，谓语动词都是went,是简单句里面的成分并列；这个题目里面并列的是三个句子，maintaining, moderating, giving都是谓语动词，身后跟了不同的宾语，并列句之间用逗号隔开。
投资100刀，每年挣2刀是逻辑关系上的并列。
乱说。。maintaining，moderating，giving不算是谓语，而是动名词（所以也是名词）。
应该是，两个名词并列时不用逗号，三个名词并列需要逗号。
I like apple, banana and orange.
总不能说是I like apple banana and orange.吧？
关于and前面的逗号，我的理解是，题中的成分太长，为了清晰和避免歧义，所以在and前面加逗号。
登录 或 注册 后可以参加讨论
有外延与内涵吧
对啦。没有名词与动词的区别？
想问一下，c选项如果不要and，直接 ‘逗号+ by doing’ 和 “逗号+doing”在语义上有区别吗？