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  3. Man adapted physically as well as culturally to the new surroundings into which he moved. Those who stayed in or moved to equato

Man adapted physically as well as culturally to the new surroundings into which he moved. Those who stayed in or moved to equato

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问题 Man adapted physically as well as culturally to the new surroundings into which he moved. Those who stayed in or moved to equatorial climates developed dark skin to protect them from the rays of the sun. Those who moved to colder climates developed light skin to take advantage of the sunlight for the synthesis of vitamin D. People in cold dry climates became stocky, to conserve heat. People in hot dry climates tended to become tall and thin, to dissipate heat.
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答案 人类在身体和文化方面都适应于他们迁入的新环境。为保护自己免受太阳辐射的伤害，居住或迁入赤道气候带的人形成了深色皮肤。为了利用阳光合成维生素D，迁移到气候寒冷地带的人形成了浅色皮肤。为保存热量，寒冷而干燥地区的人长得矮壮；而为了散热，住在干燥而炎热地区的人倾向于长得又高又瘦。
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