问个句子结构sec12-16

16. New techniques in thermal-scanning photography, a process that records radiation from surface areas, makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before.
(A) makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before
(B) make it possible to study, in greater detail, the effects of calefaction, or warming, of a river than ever before
(C) have made it possible to study in greater detail than ever before the effects of calefaction, or warming, of a river
(D) make possible the study of the effects of calefaction, or warming, of a river in greater detail than it ever was before
(E) has made it more possible than ever before to study in greater detail the effects of calefaction, or warming, of a river

答案C.没有问题.  提亮部分结构不是很明白. 是effects of ...和warming of...两个名词短语并列吗? 这样的话,warming和of 间干嘛加个逗号? 

up

my two cents:

     effects of calefaction, or warming, of a river

 =  effects of calefaction of a river or effects of warming of a river.

effects of calefaction, or warming, of a river

calefaction:暖，发暖。I think "or warming" may be Tong-Wei-Yu of "calefaction",

否则意思就变了

两个逗号起到同为的作用

effects of calefaction of a river.   然后or warming插入中间.

厉害!! 懂了懂了..谢谢大家

长见识