D)Scientists’vision of the world in halfa century

　　2, According to Harvard professor Steven Pinker,predictions about the future___B__.

　　B)may not come true

　　3, Professor Bruce Lahn of the University of Chicago predicts that_A___.

　　A)humans won’t have to donate organs for transplantation

　　4. According to professor Richard Miller of the University of Michigarr, prople will___C_.

　　C) life to 100 and more with vitality

　　5.Priceton professor Freeman Syson thinks that__C__.

　　C)alien life will likely be discovered

　　6.According to Princeton professor Richard Gott,by setting up a self-sufficient colony on Mars,

　　Humans___A.

　　A, Might survie allcatastrophes on earth

　　7.Ellen Heber-Katz, professor at the Wistar Institue in Philadelpia,predicts that_D_.

　　D)lost fingers and limbs will be able to regrow