Reason for skin color The reasons for different skin colors mainly
3
in biology and history.
Biology reasons The amount of melanin, by which a person’s skin color is 4
, varies from people to people. The more melanin a person has, the 5
his or her skin will be.
Vitamin D is another source
6
skin color. Vitamin D is necessary for humans to build bones. Sunlight contributes to vitamin D in the skin.
Historical reasons The earliest
people in Africa dad dark skin with hair covering it because the sunlight is very strong.
When they moved to places where they could not get enough sunlight to
7
vitamin D, their skin color became lighter.
Generally speaking, people in areas with strong sunlight, have darker skin
8
people in other areas have lighter skin.
9
Melanin
10
an important role in our skin color. With our living environment changing, melanin production is changed, which leads to the changes in our skin color.
四、书面表达根据下列图表的提示,写一篇你在意大利罗马旅游观光的日记。
注意:词数150。
May 1st
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