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  3. Heredity(遗传)is not the only thing that influences our colour. Where and how we live after we are born is important too. For inst

Heredity(遗传)is not the only thing that influences our colour. Where and how we live after we are born is important too. For inst

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问题     Heredity(遗传)is not the only thing that influences our colour. Where and how we live after we are born is important too. For instance, our skin colour greatly 【B1】______how much sunshine we get.
    Centuries ago, most people in Europe were peasants and had to work in the fields all day. On the other hand, noblemen did not have to work. They stayed 【B2】______and remained pale. You could always 【B3】______a nobleman from a peasant because the peasant had a tan. As a result, noble women did their best to keep their skins as 【B4】______as possible. A skin so pale was considered a mark of great beauty and 【B5】______.
    During the Industrial Revolution, farmers left their fields and went to work in factories, mines and mills. Working for long hours in those dark places made their skins pale. 【B6】______people, however, could afford to travel to sunny countries. They 【B7】______on the beaches and got a tan, which became a sign of wealth. In Western Europe and North America pale skin is no longer 【B8】______. The desire for a quick tan has 【B9】______the invention of pills that darken the skin without exposure to sunlight.
    So there are three answers to the question "Where does our colour come from?" — It comes from the genes we inherit. It comes from the 【B10】______in which we live. And it can come from a bottle that we buy at the drugstore on the corner.
【B10】
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答案conditions
解析 conditions，意为“环境”。
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