The light is disrupting (干扰) the body clock，which comes from our evolutionary (进化的) past when we were active when it was light in the day and resting when it was dark at night.Light changes moods，physical strength and even the way we process food in a 24－hour cycle.

　　Prof Derk－Jan Dijk，from the Surrey Sleep Centre，said there would be no harm in trying to make bedrooms darker.He told the BBC：“People in general are not aware of the light present in their bedroom，I think people should assess their bedroom and see how easy it would be to make it darker.” “Overall this study points to the importance of darkness，” he concluded.

　　【语篇解读】　明亮的卧室与肥胖有关系。

　　1．What does the passage mainly talk about?

　　A．People should buy thicker curtains.

　　B．Light bedrooms are linked to obesity.

　　C．People should turn off lights.

　　D．Dark bedrooms are linked to obesity.

　　答案　B　[主旨大意题。根据全文内容尤其是第一段“Sleeping in a room with too much light has been linked to an increased risk of gaining weight，a study shows.”可知，本文主要讲述的是在光线太强的房间睡觉会有增加肥胖的风险。]

　　2．What will make the researchers go on their scientific investigation?

　　A．Light exposure.

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