（2016高考训练）阅读下列材料，从每题所给的选项中选出最佳选项。
体裁：科普文 话题：健康生活 词数：350 时间：6′
Sleeping in a room with too much light has been linked to an increased risk of gaining weight，a study shows.A team at the Institute of Cancer Research in London found women had larger waistlines if their bedroom was “light enough to see across” at night.However，they say there is not enough evidence to advise people to buy thicker curtains or turn off lights.
