It only __________ him 20 minutes __________ to his office every day.

A.takes；to drive B.take；drive C.takes；drive

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Different from common belief, blue light may not have a strong negative effect as people thought-according to the scientists from the University of Manchester.

It's known that our body clock measures brightness through melanopsin(黑素蛋白)，a specialized light sensitive protein in the eye. So there has been lots of interest in studying the influence of light on the body clock. Researchers changed the make-up of short and long wavelength light, which provided a small difference in brightness, as well as changes in color. Findings suggested blue light might be troublesome to our sleep patterns.

The new research, however, used a different method, since the changes in color may oppose the benefits from reducing the brightness signals detected(探測(cè))by melanopsin. The team used specially designed lighting to change color without changing brightness.

Findings of the new research showed that blue colors produced weaker effects on the subjects' body clock than equally bright yellow colors. "Our recognition of color comes from the retinal cone cells(視網(wǎng)膜錐形細(xì)胞)，and the blue color signals they supply reduce the influence of light on the body clock," explained the lead researcher. "The research shows the common view that blue light has the strongest effect on the body clock is misguided.”

According to the team, using dim(昏暗的)，cooler lights in the evening and bright warmer lights during the day may be more beneficial to ensure healthy patterns of sleep. Twilight(暮光)is both dimmer and bluer than daylight and the body clock uses both of those features to decide on the proper times to be asleep and awake.

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Setting our body clocks in line with our social and work schedules can be good for our health, and using color correctly could be a way to help us better achieve that.

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B.Blue light has the weakest effect on people's body clock.

C.Blue light is not as harmful to their sleep patterns as people thought.

D.Blue light benefits people more in their sleep patterns than yellow light.

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