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.lt also could lead to research in-to ways to change skin color without damaging it like chemical treatment did on Michael Jackson.

　　56.Scientists have done an experiment on a dark -striped zebrafish in order to

　　A.fincl the different genes o humans'

　　B.prove the humans' skin color is determined by the pigment gene

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

　　D.fincl out the ways of changing people's skin color

　　57.lt can be inferred from the passage that

　　.

　　A.nowadays people who want to change their skin color have to suffer 8 lot from the damage caused by the chemical treatment

　　B.Europeans and Africans have the same gene

　　C.the new discovery could help to find medical treatments for skin cancer

　　D.there are two kinds of genes

　　58.The passage mainly tells us that

　　.

　　A.scientists have found out that people's skin color is determined by the gene

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

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