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题库 / OG2016-SC-23
Discussion of greenhouse effects have usually had as a focus the possibility of Earth growing warmer and to what extent it might, but climatologists have indicated all along that precipitation, storminess, and temperature extremes are likely to have the greatest impact on people.
Discussion of greenhouse effects have usually had as a focus the possibility of Earth growing warmer and to what extent it might,
Discussion of greenhouse effects has usually had as its focus whether Earth would get warmer and what the extent would be,
Discussion of greenhouse effects has usually focused on whether Earth would grow warmer and to what extent,
The discussion of greenhouse effects have usually focused on the possibility of Earth getting warmer and to what extent it might,
The discussion of greenhouse effects has usually focused on whether Earth would grow warmer and the extent that is,
题目分析：
focus这个词本身既可以是名词又可以是动词，但是，在(A)(B)两个选项中的focus必然为名词。因为，只有名词身前才能有冠词（a focus），并且也只有名词才能有物主代词（its focus）。划线部分的意思是：对温室效应的讨论一般会关注全球气候变暖的可能性，以及会达到何种程度。
选项分析：
A选项：主谓不一致，主语discussion是单数，所以其谓语动词也应为单数，即，has；
其次，本选项可以看作一个倒装句，还原为正常语序则有：
Discussion of greenhouse effects have usually had the possibility as a focus.
按照字面理解，这句话的意思是，讨论拥有一个可能性来作为关注。显然地，这是不正确的。正确的意思是，讨论关注了一种可能性。
再次，possibility定语部分（of型所有格）的核心词为Earth（Earth身后的现在分词短语growing warmer是它的定语），但在逻辑上，我们关注的应该是地球变暖这个事件的可能性，而不是地球本身的可能性。
B选项：focus错误同选项(A)。
C选项：Correct. 本选项在语法和逻辑上均是正确的。很多同学可能不明白这里由并列连词and连接的两者平行的现象。实际上，这是一个省略和倒装的现象，还原后则有：
Discussion of greenhouse effects has usually focused on whether Earth would grow warmer and Discussion of greenhouse effects has usually focused on what extent Earth would grow to.
划线部分均为省略内容。介词to倒装在了what extent身前。
D选项：主谓不一致错误同(A)；核心词错误同(A)。
E选项：and连接的两者不平行，即，the extent that is和whether Earth would grow warmer不平行。前者应该改为：to what extent。
OG解释A：The phrases the possibility...warmer and to what...might are not parallel.
B:The verb form has had as its focus is unnecessarily wordy; the noun clauses are parallel in form, but it is not clear what the extent refers to.
relative judgements：
A：had as a focus
B：had as its focus
VS focused on
主语为（the）discussion，主谓不一致排除A、D
根据句意，是关注某件事，而不是有一个关注，排除B
E，不平行
C correct
别忘了主谓不一致，很费解的选项很可能是倒装
别忘了主谓不一致，很费解的选项很可能是倒装
主谓一致 ad排除
e最后不平行
b读着啰嗦
由并列连词and连接的两者平行的现象。实际上，这是一个省略和倒装的现象，还原后则有：
Discussion of greenhouse effects has usually focused on whether Earth would grow warmer and Discussion of greenhouse effects has usually focused on what extent Earth would grow to.
划线部分均为省略内容。介词to倒装在了what extent身前。
A: Discussion of greenhouse effects have usually had the possibility of Earth growing warmer and (had) what extent it might to as a focus ;
B: Discussion of greenhouse effects has usually had whether Earth would get warmer and what the extent would be as its focus ;
大概是这样吧～
growth warmer and ( grow) to what extent. C 选项 and 并列平行下谓语的的省略
出错原因是对选项C中的and并列成分认识错误，没有识别出是倒装和省略。错选了E。主要还是对平行结构认识不深刻。切记！
precipitation沉淀，凝结
A选项倒装，应为 Discussion of greenhouse effects have usually had the possibility ......as a focus.意为讨论有可能性来作为焦点，显然不对。再次，possibility of Earth「 growing warmer」，of型所有格的核心词是earth，逻辑上我们关注的是地球变暖的可能性，而不是地球的可能性。
C选项倒装和省略，应为Discussion of greenhouse effects has usually focused on whether Earth would grow warmer and Discussion of greenhouse effects has usually focused on what extent Earth would grow to.
a选项算一个小到装了
A选项：主谓不一致，主语discussion是单数，所以其谓语动词也应为单数，即，has；
其次，本选项可以看作一个倒装句，还原为正常语序则有：
Discussion of greenhouse effects have usually had the possibility as a focus.
按照字面理解，这句话的意思是，讨论拥有一个可能性来作为关注。显然地，这是不正确的。正确的意思是，讨论关注了一种可能性。
再次，possibility定语部分（of型所有格）的核心词为Earth（Earth身后的现在分词短语growing warmer是它的定语），但在逻辑上，我们关注的应该是地球变暖这个事件的可能性，而不是地球本身的可能性。
and前后不平行。
C选项：Correct. 本选项在语法和逻辑上均是正确的。很多同学可能不明白这里由并列连词and连接的两者平行的现象。实际上，这是一个省略和倒装的现象，还原后则有：
Discussion of greenhouse effects has usually focused on whether Earth would grow warmer and Discussion of greenhouse effects has usually focused on what extent Earth would grow to.
划线部分均为省略内容。介词to倒装在了what extent身前。
E的and链接不对等，应该用to what extent
Discussion of greenhouse effects has usually focused on whether Earth would grow warmer and Discussion of greenhouse effects has usually focused on what extent Earth would grow to.
A这样的要注意！
Possibility as a focus
Focus on whether and to what extent
discussion是单数，所以AD排——B选项has had语义不清排除——剩下CE，E选项中whether和extent两者并不平行，C意思是地球是否变暖且到达什么程度and to what extent
前：the discussion和不加the都是可以的，这里不必过度纠结，看后面原则错误
后：and 并列 focus on whether 。。and to what extend
Discussion of greenhouse effects has usually focused on whether Earth would grow warmer and Discussion of greenhouse effects has usually focused on what extent Earth would grow to.
划线部分均为省略内容。介词to倒装在了what extent身前。