题型:阅读理解 题类:常考题 难易度:普通
福建省三明市第一中学2018-2019学年高二下学期英语期中考试试卷
It's shocking that countless species become extinct every year and such extinction means forever. To change the situation, scientists are now on their way to bringing back extinct species.
DNA is the chemical that carries the structure of a living thing, which is needed by researchers to bring back a species. Dinosaurs have been gone too long for any of their DNA to remain in fossils. However it seems possible to bring back more recently extinct species such as Ice Age animal, the woolly mammoth. In 2015, a team of Spanish and French scientists re-created the Pyrenean ibex, which had gone extinct three years earlier. The new animal didn't survive long, but scientific advances should improve the success rate. In January, Australian scientists announced that they were trying to restore the brooding frog.
That we can bring species back doesn't mean that we should. There may be benefits to bring back a species. But there's no way to know how it will turn out. For example, would a passenger pigeon fit into its old habitat? Or might it crowd out existing species?
Environmentalists worry that our ability to bring species back might cut down support for the hard work of traditional conservation. Why bother to preserve a wild life habitat or fight poachers(偷猎者) if we know we can make up for our mistakes?
But those extinctions are our mistakes to correct. As environmentalist Stewart Brand put it, "Humans have the ability to repair some of that damage."
We would do well to remember the lesson of Jurassic Park: Continue with caution.
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