绿色的神奇功效

                                                                             

      Green, the mixture of blue and yellow, can be seen everywhere and in countless shades. In fact, the human eyes see green better than any color. This, along with many other facts about this color, makes it an essential part of our everyday lives. But why is that?

      Helping you see

      We see green with ease because of how light reaches our eyes; the human eyes translate waves of light into color. When we see colors, our eyes are able to process the wavelengths and tell the brain what color is being observed.

      Humans perceive three primary colors: blue, green and red. The human eye can detect light between wavelengths of 400 and 700 nanometers, a range known as the visible spectrum. In the middle of the spectrum resides the color green, at around 555 nanometers. 

      Knowing your environment

      Our ancestors lived in forest full of greenery long ago. Color changes in leaves, fruits and vegetables can indicate age or ripeness and even offer a warning that something may be poisonous or rotten. Today, we continue to use this instinct at a farmer’s market or grocery store.

      Keeping you calm

      Will seeing red help you lose weight? Some scientists and researchers also believe that because our eyes are at the peak of their perception to detect the wavelengths corresponding with the color green, the shade may calm us down. This quality of green may explain why hospitals and work environments are often painted green. 

     Helping you live longer

     Natural environments, full of green plants, might help you live longer. A 2016 study found that living in or near green areas was linked with longer life and improved mental health in female participants. Researchers from Harvard T.H. Chan School of Public Health and Brigham and Women's Hospital compared risk of death with the amount of plant life and vegetation near the homes of more than 100,000 women.

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1.What is the best title of the passage?

A Why we all need green in our lives

B How the green makes us see farther

C Where we can find blue and yellow

D When green becomes essential

解析：选A。主旨大意题。从第一段最后一句的But why is that?可以得知该文章就是介绍为什么人们在生活中需要绿色。故选A。

2.What make(s) the green to be seen more easily?

A The clever brains.

B The primary color.

C The right wavelength.

D The big eyes.

解析：选C。细节理解题。根据第三段最后一句的In the middle of the spectrum resides the color green, at around 555 nanometers可知绿色的波长为555毫微米，是适当的波长让绿色容易被我们觉察到。故选C。

3.What instinct do people use at a farmer’s market?

A Living in the deep forests.

B Recognizing differences in green plants.

C Eating leaves and fruits.

D Finding out the visible spectrum.

解析：选B。细节理解题。根据第四段第二、三句的Color changes in leaves, fruits and vegetables can indicate age or ripeness and even offer a warning that something may be poisonous or rotten.Today, we continue to use this instinct at a farmer’s market or grocery store.可以得知我们的祖先能通过判断不同的绿色而断定水果的生熟或者是否腐烂等，今天我们也在这样做。故选B。

4.Why are some hospitals painted green?

A Because the green color makes people live longer.

B Because the green color improves the risk of death.

C Because the green color helps people feel relaxed.

D Because the green color can get rid of poison in food.

解析：选C。推理判断题。根据第五段第二句的with the color green, the shade may calm us down可以得知绿色能让人镇定下来，也就是让人更加放松。故选C。