20. Studies of circadian rhythms can be applied to problems ranging from chronic insomnia in frequent transcontinental air travelers to workers in all-night plants being inefficient.
(A) to workers in all-night plants being inefficient
(B) toward workers in all-night plants being inefficient
(C) to workers in all-night plants who are inefficient
(D) to combat worker inefficiency in all-night plants（E）
(E) to decreased efficiency among workers in all-night plants
为什么不选C？range from X to Y,X和Y一致？
E是什么意思？
有大牛可以解释一下吗？
谢谢！
答案是E吧？
我觉得重要的是
range from... to....
from与to后面的性质应该是平行的。
早上一起来再看这道题目，一下子想通了，奇怪当初怎么会想不通。简单的平行关系：chronic insomnia 对应decreased efficiency ，in frequent transcontinental air travelers 对应among workers in all-night plants，结构对应。
谢谢顾风！
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