请教OG13 SC107，谢谢各位

mslancaster

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.


B选项中的for是什么意思？为什么不能删掉？谢谢！

coffeeqoo

the cost of 和（the cost）for。。。平行，省略了括号内的部分。

aduoyi

看了其他人的帖子我概括一下下：
(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 expensivefor 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 coststhat stem from building nuclear plants that makes the electricitthey 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, stemming from the fixed costsof 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 buildingnuclear plants

A中as前面是it costs ....是一个句子，as后面是other types...是一个名词，不平行
B中as前面是cost，后面是（cost）for，cost是省略的，所以前面后面都是名词，也就平行了
C中前十it cost，句子，后面是（cost）for是名词，所以不平行
D和C一样
E前面是cost，后面是types虽然同是名词，但是明显就不可用平行结构。
这样对前半部分的分析就可以判断对错了，只是，cost为什么要省略而用for，我还是比较迷惑的，但是选项没有给of神马的，也没有干扰了~~~

WayneCH2012

同样不懂，那个for不是不对称吗？the cost of running unclear plants 怎么和介词短语for other types of power plants对称呢？如果像3楼说的那应该是that of types of  power plants.这不是很好的对称吗？怎么就用for呢？

wintertrain

不用for的话原句变成cost of running nuclear plants is about the same as other types of power plants，比较对象变成cost of runnng nuclear和 cost of other plants，核工厂的运营成本与其它工厂的成本（可能是收购成本）对比。当用for时，句子变成the cost for other plants，歧义消除。