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.

　　【语篇解读】　这是一篇科普文。科学家们找到了决定人类肤色的基因。

　　25．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

　　答案　B　细节理解题。依据文章第三段可知，科学家把一种色素基因植入斑马鱼的幼鱼体内，将其变成了金色，从而证明了和人类一样，斑马鱼的肤色也是由色素细胞决定的，由此可知B项正确。

　　26．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

　　答案　A　主旨大意题。文章讲述了科学家通过研究斑马鱼发现了决定人类肤色的基因。首段中的“Scientists have found the gene that determines skin color.”即研究的结果，也是文章叙述的中心。

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