OG 13 SC 107 DUKB24又来请你现身啦

啦啦噜啦啦

107. While it costs about the same to run nuclear plants as other types of power plants, it is the fixed costs that stem from building nuclear plants that makes it more expensive for them to generate electricity.
(A) While it costs about the same to run nuclear plants as other types of power plants, it is the fixed costs that stem from building nuclear plants that makes it more expensive for them to
generate electricity.
(B) While the cost of running nuclear plants is about the same as for other types of power plants, the fixed costs that stem from building nuclear plants make the electricity they generate more expensive.
(C) Even though it costs about the same to run nuclear plants as for other types of power plants, it is the fixed costs that stem from building nuclear plants that makes the electricity they generate more expensive.
(D) It costs about the same to run nuclear plants as for other types of power plants, whereas the electricity they generate is more expensive, stemmingfrom the fixed costs of building nuclear plants.
(E) The cost of running nuclear plants is about the same as other types of power plants, but the electricity they generate is made more expensive because of the fixed costs stemming from building nuclear plants.

两个问题！
1.OG上解释说强调句型的使用 要在 emphasize the doer of the action的情况下，不是非常理解这句话，还望大神提点，有个例句什么的就再好不过了！O(∩_∩)O
2.我不明白B中While the cost of running nuclear plants is about the same as for other types of power plants 为什么是for 我理解为什么不是of，但是不知道这个for从何而来？？

奶牛316

同问，求大神帮忙解答！！！

Mia努力ing

http://gmatclub.com/forum/while-it-costs-about-the-same-to-run-nuclear-plants-as-other-134755.html

看看egmat的回复，非常的清晰~

qiongle

the cost of running for other types of power plants,如果用of的话，LZ理解一下，会和前面的of产生歧义,比较对象就变成了the cost of running nuclear plants比上the cost other types of power plants，重心就不对了。

mmmmmignon

谢谢Mia 找到为什么要加一个for的答案了~ 贴出来 方便大家看
When you are dealing with ellipsis, it always helps to begin from the completely expanded version with all the words and then move your way to the abbreviated version by applying ellipsis along the way. I will do the same here:

Let's consider only the pertinent portion of the sentence.

1.        The cost of running nuclear plants is about the same as the cost of running other types of power plants.
No issues here with the comparison. Both sides of the comparison are grammatically and logically parallel.

Now what if I replace "the cost of running" with "that". After it is obvious that we are comparing cost of running of the two categories of plants. But when I apply this ellipsis, I need something to connect "that" with "other types of power plants".

2. (Without connection with that)
The cost of running nuclear plants is about the same as that other types of power plants. WRONG

2. (with correct connection)
The cost of running nuclear plants is about the same as that for other types of power plants.
So this is where the preposition "for" comes from.

Now we continue with our ellipsis. We can indeed even omit "that" from here since this omission will not lead to any ambiguity.

3.        The cost of running nuclear plants is about the same as for other types of power plants.

So this is how I get to the correct sentence containing "for".

Now let's apply the same on the set of sentences:
1.        The incidence of the disease among men exceeds the incidence of the disease among women.
1 to 2 - The incidence of the disease among men exceeds the incidence of the disease among women.
2.        The incidence of the disease among men exceeds the incidence among women.
2 to 3 - The incidence of the disease among men exceeds the incidence among women.
3.        The incidence of the disease among men exceeds that among women.

So the key thing here is that as you replace or omit words, think about what connections you may need to get the correct sentence. The nature of the two sentences is different. In the Official sentence, the main component - cost of running - took direct object without the need of any preposition. So when we replaced this with "that" we needed a connection - i.e. a preposition. However, in the other example, the main component - incidence of the disease - itself needed a preposition to connect to the object and hence when we replaced it with "that" we did not need to get another preposition.

Thus when you cross-check your work in ellipsis, start from the complete sentence and then work your way to simplified version with replacement words and omitted words.