题目内容

Hawking says that even the best theory can________ to be wrong．

A.
turn up
B.
turn down
C.
turn off
D.
turn out

D
turn up出现；(被)发现；turndown减弱；降低；turn off关掉(水、灯等)；turn out证明是。

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Hawking says that even the best theory can________ to be wrong．

A．turn up　　 B．turn down

C．turn off　　 D．turn out

Hawking says that even the best theory can________ to be wrong．

A．turn up　　 B．turn down

C．turn off　　 D．turn out

Should we try to contact and make friends with other beings in the universe? Certainly not，says British physicist Stephen Hawking．
“If aliens（creatures from other planets）ever visit us, I think the outcome would be much as when Christopher Columbus first landed in America, which didn’t turn out very well for the Native Americans,’’ said the 68-year-old disabled scientist in a new Discovery documentary (纪实性电视节目) on April 25．
The program pictures an imagined universe where other life forms in huge spaceships hunt for resources after using up all those on their home planets．
“Such advanced aliens would perhaps become nomads(游牧民)，looking to conquer and colonize whatever planets they can reach，”warned Hawking．
On the probability of other life forms existing, he says, “To my mathematical brain, the numbers alone make thinking about aliens perfectly reasonable.”
Hawking’s concerns have frightened some people and been met with disagreement from other researchers．Paul Davies, author of the book Renewing Our Search for Alien Intelligence，thinks Hawking’s reasoning is wrong.
He argues that since Earth is about 4.5 billion years old，if intel1igent life is likely , communities of other beings may have been there for a very long time．
“If resources are the factor, then at least one group of aliens would surely have visited Earth as a destination mil1ions of years ago．
Even if other life forms do come to Earth in the near future, Davies believes comparisons with are wide of the mark(离谱的).
68. What is the article mainly about?
A. Other life forms coming to our planet．
B. Scientific evidence of other life forms．
C. Earth as the only place where human beings can survive．
D. Hawking’s belief that other life forms may exist in the universe．
69. Which of the following ideas is opposed to Hawking’s view?
A. Other life forms exist in the universe．
B. 0ther life forms may be more intelligent than human beings．
C. We should try to contact other 1ife forms from other planets．
D. Other life forms may exist in more than one part of the universe．
70. Paul Davies didn’t agree with Stephen Hawking ,believing that ________．
A. the universe is running out of resources
B. humans are the best creatures in the universe.
C. it is a good idea to avoid meeting with other life forms
D. Davies doesn’t think it proper to compare aliens with Columbus
71. Hawking referred to Christopher Columbus as an example to ____．
A. inspire interest in the universe
B. draw attention to other planets in the universe
C. warn people to watch out for other life forms
D. urge further exploration of the universe~

Humans： It's time to abandon Earth or Race Extinction.

It could be the plot of a summer blockbuster (巨片），but this prediction isn't science fiction. It's a glimpse of the future ，according to famous British scientist 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 long-term 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 (游牧者），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 that “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.”

60. Humans are advised to abandon Earth mainly because _____.

A. aliens will take up our home planet soon　 B. many disasters will happen on the Earth

C. resources will be used up in the future　　 D. humans need larger space to live in

61. Thinking about the future of humans, Hawking feels that _____.

A. humans will probably become extinct　　

B. aliens are the biggest future threat to humans

C. other planets are ready for humans to reach　

D. the earth will not be habitable for humans

62. What is the writer's key point in the last paragraph?

A. It is impossible to get to another planet in space.

B. The present means of transport are not advanced at all.

C. The near future can't see human's move to another planet.

D. The planet Proxima Centauri is the closest to the earth.

63. This passage is most probably taken from _____

A. a conference interview　　　　　　　　　　 B. a science fiction

C.　 a forum report 　　　　　　　　　D. a history book

Hawking says that even the best theory can________ to be wrong．

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