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

　　D．people cannot change their skin color without any pain

　　7．The reason why Europeans are light­skinned is probably that________.

　　A．they are born light­skinned people

　　B．light­skinned Europeans have mutation in the gene for melanin production

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