The light is disrupting the body clock, which stems from our evolutionary past when we were active when it was light in the day and resting when it was dark at night. Light alters

　　mood，physical strength and even the way we process food in a 24­hour cycle. Artificial light is known to disrupt the body clock by delaying the production of the sleep hormone melatonin.

　　Prof.Derk­Jan Dijk 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.” Street lights, ld light a room, he said.“Overall this study points to the importance of darkness，” he concluded.

　　5．The passage mainly tells us ________． should buy thicker curtains

　　6．What does the underlined word “disrupting” in Paragraph 4 mean?

　　A．Stopping.

　　B．Disturbing.

　　C．Improving.

　　D．Recovering.

　　7．What might Paragraph 4 be used for?

　　A．One possible explanation on disrupting body clock.

　　B．One possible explanation on disrupting mood.

　　C．One possible explanation on disrupting physical strength.

　　D．One possible explanation on artificial light.

　　8．What’s Prof.Derk­Jan Dijk’s attitude towards the dark room?

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