E中的body heat为什么不能和前面的body heat平行？

a选项burning前不应该加by吗

选项(A)和选项(D)的迷惑性相对较高。介词短语 for generating it需改为不定式短语to generate it。这点考查了不定式和ing的区别。用之于本题，由于变化部分是burn的宾语的补足语，所以应根据其主句谓语动词burn来判断。在逻辑上，“燃烧卡路里”显然可以控制“生产热”这个行为的发生与否，即，本题中的burn的控制力较强，宾补中应该用不定式短语。

"instead of" contains "of", which should be followed by a noun. so, "instead of" should be followed by a noun (or by something that acts as a noun, such as some -ing forms).

on the other hand, "rather than" can connect just about any two similarly structured things.
nouns: I decided to purchase a truck rather than a car.
adjectives: I wish this transmission were manual, rather than automatic.
etc.
also, it can connect things that aren't technically the same grammatically but that play the same grammatical role. e.g.
it's best to read the passages quickly, rather than with precise attention to every little detail.
--> here, both the adverb "quickly" and the modifier "with precise attention..." modify the action of reading the passages. so, all good.

there's also a very slight difference in meaning. I'll bet you 99.99% that gmac will never actually test this, but ...
... "X instead of Y" means that "Y" was some sort of default / assumed/preferred outcome, but that X has been substituted for it.
... "X rather than Y" indicates no such preference; it just means that there were options X and Y, and, this time, X won.

e.g.
He paid with a check rather than cash.
--> He had two options, and chose the check.

He paid with a check instead of cash.
--> He was supposed to pay in cash, but he paid with a check.

again, the likelihood that this will ever actually be tested is pretty much nil, but, there it is.

rather than by burning calories to generate it
by drawing 与by burning平行

D instead 和of by 两个介词连用错误

instead of 都可以modify noun
refer to this question(GMATLA-SC-108) :Most of Portugal's 250,000 university students boycotted classes in a one-day strike to protest a law that requires them to contribute $330 a year toward the cost of higher education, instead of the $7 per year required previously

A: IT=BODY HEAT, 无歧义；burning calories和the sun并列
B: the generation和Body heat并列，句意不合理

E中的body heat 不是和Sun平行吗？

rather than和instead of的区别:
语意：rather than表示it's A but not B，instead of表示用一物取代另一物
成分：rather than做连词，表示并列关系；instead of做介词时构成介宾结构，做定语修饰先行词或状语修饰谓语动词，属于修饰成分，地位更弱些。
instead of通常是介词，也可以做连词的，如：They go there on foot instead of by bus.
A instead of B，表示B是默认/假设/首选的结果，但是A代替了它
A rather than B则没有这个意思，它仅仅表示有两个options：A and B，这一次人们选了B。如：
He paid with a check rather than cash. 他用了支票付款。
He paid with a check instead of cash.他本来要/以前一直是/人们还以为他会付现金，但他用支票付了。
一般GMAC不会考这个差异，看选项的其他地方。

1、D、instead of 介词后面不能加介词
【不定式和ing的区别】介词短语 for generating it需改为不定式短语to generate it。这点考查了不定式和ing的区别。用之于本题，由于变化部分是burn的宾语的补足语，所以应根据其主句谓语动词burn来判断。在逻辑上，“燃烧卡路里”显然可以控制“生产热”这个行为的发生与否，即，本题中的burn的控制力较强，宾补中应该用不定式短语。

rather than VS instead of：
A instead of B，表示B是默认/假设/首选的结果，但是A代替了它
A rather than B则没有这个意思，它仅仅表示有两个options：A and B，这一次人们选了B。如：
He paid with a check rather than cash. 他用了支票付款。
He paid with a check instead of cash.他本来要/以前一直是/人们还以为他会付现金，但他用支票付了。
一般GMAC不会考这个差异，看选项的其他地方。

rather than和instead of的区别:
语意：rather than表示it's A but not B，instead of表示用一物取代另一物
成分：rather than做连词，表示并列关系；instead of做介词时构成介宾结构，做定语修饰先行词或状语修饰谓语动词，属于修饰成分，地位更弱些。
instead of通常是介词，也可以做连词的，如：They go there on foot instead of by bus.

链接到Prep2012-SC-18，instead of后面接的是名词，也是rather than更优。

rather than只要平行，ing、noun、to do 随便你加

rather than后面prefer verb， instead of后面prefer noun
to do表目的
A选项rather than前后满足平行

看到底是跟by并列还是跟from并列，是动词分词的跟by并列，是名词的跟from并列。一个一个带进去，看哪个选项平行和语意都满足。

在逻辑上，“燃烧卡路里”显然可以控制“生产热”这个行为的发生与否，即，本题中的burn的控制力较强，宾补中应该用不定式短语。（to do）

老师，我看你讲的“比较级”的内容里，提到了rather than和instead of，那么分析这个题目时，处理rather than和instead of是根据“比较级”的原则呢？还是依据A/B中的平行原则，以及D的语法错误，以及E的状语修饰问题？

mark, 并列问题，A里burning是可以和drawing并列的，不一定要是By burning. 相反，B里generation的并列对象是body heat, 名词对名词，所以B成了by drawing generation. 错！

两个介词不能放一起