题型：阅读选择 题类：模拟题 难易度：普通
北京市海淀区2020届九年级5月模拟考试英语试卷
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（探测）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 （视网锥形细胞）, 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.
The findings have important suggestions for the design of lighting and visual displays which aim to promote people's sleep patterns. Present technologies are mostly designed to limit our evening exposure to blue light by changing the screen color of mobile devices. The technology, however, may send the body clock mixed messages. This is because the small changes in brightness they produce come along with colors that are commonly seen during the day. So there's more for the designers to take into Consideration.
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.
New Hope Middle School After School Clubs | |
Monday—Cooking Club This is a fun club. You can make delicious food with your friends! But only healthy food! We are waiting for you in Room 204. Price:¥40 per* term |
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Tuesday—Sporty Fun A fun activity for all the sport lovers! Enjoy all kinds of sports every week on the playground. You don't need to bring your PE kit because we've got it. Price: ¥20 per term |
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Wednesday—LE00 Club Who does not like LEGO? Come and join the club each Wednesday in Room 203. There will be a different theme every week. Price: ¥80 per term |
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Thursday—Music Club It's time to show your musical talents! If you are interested in music, you can learn to sing with Ms. Diana in Room 304. Price: ¥50 per term, half price for this term |
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Friday—Free Choice We can do what we like! Members of all clubs can join with Mr. Martin to play board games, draw pictures or even go outdoors at the end of the week! Price: Free Come and join us! |
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Do you know how to start a club at school? Here are some helpful ideas for you:
Photo Club Many students don't know how to take photos. A photo club can help. You can give camera setting(设置) lessons to students. What you need: A classroom; some cameras; some apps. |
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LEGO Club Who doesn't love building with LEGO? In this club, you can have a LEGO-building match(比赛) every week, like making the best cars or the most beautiful restaurant with LEGO. What you need: A classroom; LEGO. |
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Gardening Club A gardening club can be a lot of fun for students. They can learn how to grow their own vegetables and flowers. They can also learn to work with other students. It's useful. What you need: Small farms; plants and seeds(种子); gardening tools(工具). |
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excite but first what plan win work possible last idea we of |
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