题型：语法填空（语篇） 题类：常考题 难易度：困难
黑龙江省大庆市铁人中学2019-2020学年高二下学期第一次月考学英语试题
Color blindness is very common. It affects (rough) 1 in 12 men and 1 in 200 women in the world. People blindness can't see colors in a normal way.
There are (variety) causes of color blindness. For the majority of color-blind people, color blindness is genetic, although some people become color-blind as a result of other diseases, such as diabetes(糖尿病), or they have condition over time due to the aging process, etc.
Most color-blind people can see (thing) as clearly as other people, but they are unable to fully "'see" red, green or blue light. There are different types of color blindness but there are extremely rare cases people are unable to see any color at all. The most common color blindness is red/ green color blindness. Although (know) as red/green color blindness, it doesn't mean (suffer) will only mix up red and green. It means they mix up all colors that have some red or green as part of the whole color.
The effects of color blindness can (classify) into mild，moderate(中等的) or severe. About 40% of color-blind people are even unaware that they're color-blind. Statistically speaking, most people (have) a moderate form of red/ green color blindness can only identify 5 colored pencils from a standard box of 24 pencil crayons.
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