D.aliens are the biggest future threat to humans
解析:选B 推理判断题。根据文章第七段中的“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。
3.What is the writer's key point in the last paragraph?
A.It is impossible to get to another planet in space.
B.It is urgent for Hawking to develop the space science.
C.The near future can't see human's move to another planet.
D.The planet Proxima Centauri is far away from Earth.
解析:选C 推理判断题。根据文章最后一段的内容可知,人类借助现在的火箭科学技术,短时间内是不可能到达离地球最近的Proxima Centauri (比邻星)的,所以人类搬去另外一个星球在不远的将来是不会实现的。故答案为C。
4.This passage is most probably taken from ________.
A.a conference interview
B.a science fiction
C.a history book
D.a forum report
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