Ⅳ.阅读理解it’s time to abandon Earth or race extinction.

　　It could be the plot of a summer blockbuster (大片)，but this prediction isn’t science fiction.It’s a glimpse of the future，according to famous British scientist Stephen Hawking.，”he said in an interview with global forum Big Think.“There have been a number of times in the past when its survival has been a question of touch and go.”e of the human race must be in space，”he said.“It will be difficult ，let alone the next thousand，or million.”，who was awarded the Presidential Medal of Freedom last year，has recently voiced many concerns about the future of life on Earth.，the outcome would be as much as when Columbus landed in America，which didn’t turn out well for the Native Americans，”he said.“Such advanced aliens would perhaps become nomads (游牧民)，looking to conquer and colonize whatever planets they can reach.”，“We’ve made remarkable progress in the last hundred years.But if we want to continue beyond the next hundred years，our future is in space.”，not to mention colonizing it for humanity.Katherine Freese from University of Michigan told Big Think，“the nearest star to Earth is Proxima Centauri which is 4.2 light years away.That means，if you were traveling at the speed of light the whole time，it would take 4.2 years to get there—or about 50，000 years using current rocket science.”解题导语　文章主要介绍了英国著名的科学家斯蒂芬·霍金对人类未来的预测。 to abandon Earth mainly because

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