PREP 36

Scientists at the Los Alamos National Laboratory have succeeded for the first time in mining heat from the Earth’s interior and producing energy on a commercial scale, enough for efficient generation of electricity and heating factories and homes.
A. and producing energy on a commercial scale, enough for efficient generation of electricity and heating
B. and producing enough energy on a commercial scale for electricity to be generated efficiently and to heat
C. for energy production on a commercial scale, enough for generating electricity efficiently and to heat
D. to produce energy on a commercial scale, enough for generating electricity efficiently and for heating
E. to produce enough energy on a commercial scale for efficient generation of electricity and heat

答案中解释：

A: and没有平行的对象

B: 同上

C: production不如produce表达的清楚；for generating 和 to heat 不平行

D: correct

E: generation 不如generating 表达的清晰；and heat应该和for平行而不是和to produce

注意：

1．名词形式和动词形式的比较，在表达动作本身而不是结果的时候应该用动词

2．To produce and heat 还是for generating and for heating，应该从逻辑意思判断

我选了E。答案解释中， generation 不如generating 表达的清晰。这个未必吧？ 印象中只有动词原型是最清晰的。而且我觉得and heat 就是应该和produce平行-----to produce energy and heat factories and homes

heat有宾语应该是动词啊，E的generation和heat不对称啊，要是produce与heat对称的话

mining heat from the Earth’s interior　to heat　factories and homes，应该是生产出的energy去 heat吧