問題詳情

Each year, an estimated 10,000 to 100,000 animal species die off. Scientists are now closing in on the abilityto bring back extinct species. No, this doesn’t mean the plot of Jurassic Park is going to become a reality.Researchers need DNA to bring back a species. DNA is the chemical that carries the structure for a living thing.Dinosaurs have been gone too long for any of their DNA to remain in fossils.But there’s a very real chance that we will be able to bring back more recently extinguished species. Thiscould even include Ice Age animals like the woolly mammoth. In 2003, a team of Spanish and French scientistsre-created the Pyrenean ibex, which had gone extinct three years earlier. The new animal didn’t survive long, butscientific advances should improve the success rate. In January, Australian scientists announced that they were ontheir way to bringing back the gastric brooding frog.Just because we can bring species back doesn’t mean that we should. There may be benefits to reviving aspecies. But there’s no way to know how it will turn out. For example, would a passenger pigeon fit into its oldhabitat? Or might it crowd out existing species?Environmentalists worry that our ability to bring species back might cut down support for the hard work oftraditional conservation. Why worry about preserving a wildlife habitat if we know we can just reverse ourmistakes?But those extinctions are our mistakes to correct, which may give us an obligation to do so. As businessmanand environmentalist Stewart Brand recently said, “Humans have made a huge hole in nature. We have the abilitynow ... to repair some of that damage.”
46. What does this passage mainly discuss?
(A) Should scientists re-create extinct species?
(B) Are scientists able to bring back extinct animals?
(C) Is the plot of Jurassic Park going to become a reality?
(D) Should the hard work of traditional conservation be continued?

參考答案

答案：A
難度：適中0.681176
統計：A(579),B(147),C(46),D(78),E(0)

內容推薦

內容推薦