D.One possible explanation on artificial light.
解析:选A 篇章结构题。根据第四段第一句“The light is disrupting the body clock ...”及最后一句中的“Artificial light is known to disrupt the body clock”可知,本段主要解释了光线会干扰人体生物钟的可能原因。故选A项。
11.What's Prof. DerkJan Dijk's attitude towards the dark room?
A.Unclear.
B.Doubtful.
C.Negative.
D.Favorable.
解析:选D 观点态度题。根据最后一段第一句中“there would be no harm in trying to make bedrooms darker”及最后一句可以看出,DerkJan Dijk 教授赞成将卧室的亮度调暗。故选D项。
D
(2016·广西桂林一模)
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