Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultra­violet rays of the sun，which can cause skin cancer.

　　But when modern humans leave Africa to live in northern latitudes，they need more sunlight on their skin to produce vitamin D．So the related gene changes，according to Cheng.

　　Asians have the same version of the gene as Africans，so they probably acquired their light skin through the action of some other gene that affects skin color，said Cheng.

　　The new discovery could lead to medical treatments for skin cancer.It also could lead to research into ways to change skin color without damaging it like chemical treatment did on Michael Jackson.

　　5．Scientists have done an experiment on a dark­striped zebrafish in order to________.

　　A．find the genes that are different from humans’

　　B．prove the skin color of zebrafish is determined by the pigment gene

　　C．find out the reason why Africans’ skin color is dark

　　D．find out the ways to change people’s skin color

　　6．The passage mainly tells us that________.

　　A．scientists have found out the gene that determines people’s skin color

　　B．the new discovery could lead to research into ways to change skin color safely

　　C．pop king Michael Jackson often changed his skin color as he liked

【2017高考英语三轮冲刺阅读强化训练2】相关文章：

★ 贵州省贵阳市2014高考英语（新人教版）一轮阅读训练（40）附答案

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (53)

★ （全国通用）2014届高考英语一轮单元复习 限时强化训练六

★ 2017届高考英语三轮冲刺复习：完形与阅读强化训练2

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (46)

★ 常熟市2014高考英阅读理解语一轮（暑假）训练题（10）及答案

★ 2017高考四川省广安市英语阅读理解一轮系列训练：30（含解析）

★ 2017高考英语三轮冲刺阅读强化训练12

★ 2016高考英语二轮复习提高阅读能力要加强课外阅读

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (9)