1.Reptiles, by drawing their body heat directly from the Sun rather than burning calories to generate it, can survive on ten percent of the nourishment that a mammal of similar size would normally require
A. rahter than burning calories to generate it
B. rather than the generation of body heat by burning calories
C. and not from generating it by burning calories
D. instead of by burning calories for generating it
E. instead of body heat generated by burning calories
是选A还是D？觉得A的to generate 比D的forgenerating好，但是rather than 后面好象是不能带-ing的，是不是？那选D行吗？
rather than是个连词，“ 通常用于“平行”结构中：例如与2个形容词，状语，名词，动词不定式或2个ing形式连用。（参见《英语用法指南》micheael swan P666)。”
instead of是介词词组，感觉ETS不喜欢instead of。根据经验，好像ETS认为instead of后面应该只能接名词和动名词或代词短语。.
而且burning calories to generate it 要比burning calories for generating it 好。
rather than连接的2个成分是by的2个并列的动名词宾语，所以A应该是合理的并列。rather than后不加by应该是可以的。
1.Reptiles, by drawing their body heat directly from the Sun rather than burning calories to generate it, can survive on ten percent of the nourishment that a mammal of similar size would normally require
A. rahter than burning calories to generate it
a
by doing... rather than doing
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