A. people can not change their skin color without any pain

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

　　17. It can be inferred from the passage that ________.

　　A. nowadays people who want to change their skin color have to suffer a 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

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

　　A. find the different genes of 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. find out the ways of changing people’s skin color

　　19. The reason why Europeans are light-skinned is probably that _____

　　A. they are born light-skinned people

　　B. light-skinned Europeans have mutation in the gene for melanin production

　　C. they have fewer activities outside

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