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Ⅰ.阅读理解 (2017·成都市高中毕业班第一次诊断)Humans：it’s time to abandon Earth or race extinction.(大片)ntist Stephen Hawking. “I see great dangers for the human race，” 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.” “I believe that the longterm future of the human race must be in space，”he said.“It will be difficult enough to avoid disasters on planet Earth in the next hundred years，let alone the next thousand，or million.” Hawking，who was awarded the Presidential Medal of Freedom last year，has recently voiced many concerns about the future of life on Earth. “If aliens visited us，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.” But Hawking says he’s still hopeful for the future of humanity.He told Big Think，“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.” Getting to another planet will prove a challenge，not to mention colonizing it for humanity.Katherine Freese from University of Michigan told Big Think，“The nearest star to Earth is Proxima Centauri (比邻星) which is 4.2 light years away.That means－or about 50【文章大意】 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。 advised to abandon Earth mainly because________．解析：选D。细节理解题。根据文章第四段中的“ It will be difficult enough to avoid disasters on planet Earth in the next hundred years可知在接下来的几百年中地球上会有许多灾难发生。故答案为D。els that________．解析：选B。推理判断题。根据文章第七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.”可知我们虽然在过去的几百年中取得了卓越的进步但是如果我们要在接下来的几百年中继续延续这种进步我们将来的生活空间在太空。据此可以推断出未来地球将不再适合人类居住。故答案为B。r’s key point in the last paragraph? | 
