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
D. they pay much attention to protecting their skin
20. The writer’s attitude towards the discovery is ________.
A. neutral(中立的)
B. negative
C. positive
D. indifferent(冷漠)
—20、DABBC
阅读下列短文,从每题所给的A.B.C和D项中,选出最佳选项。
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