题目

John is a paper boy. He delivers newspapers to different houses in his street every day. He has about 80 customers. Half of his customers only take the newspapers on weekdays, and about half take the newspapers on weekdays and on Sundays. Two of John’s customers only take the newspapers on Sundays. John has to get up at 4:30 every morning to deliver his newspapers. It takes longer to deliver the newspapers on Sundays. The Sunday newspapers are twice as heavy as those on weekdays. John is saving his money to buy a new bicycle. He is also saving money for college. He has already saved 50下列有关“多莉羊的诞生”对人类社会的影响的叙述中错误的是(  )A.标志着细胞工程取得重大进展B.表明人的克隆完全可能的,也是有必要的C.人类可以利用动物身上的一个体细胞生产出与这个动物几乎相同的生物体D.标志着克隆技术可应用于利用人体细胞克隆组织和器官
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