5．Scientists have done an experiment on a dark-striped 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 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 skin8．The writer’s attitude towards the discovery is________.

　　A．neutral B．negative

　　C．indifferent　

　　D．positive

　　课时作业(十七)　

　　Ⅰ.单项填空

　　1．解析：　考查交际用语。根据答语后半部分的内容可知，答话人已经下定决心从大学辍学。故A项“是的，我已经下定决心了”，符合句意。

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