The question of whether or not we are alone in the galaxy(银河系) is one that has interested everyone. From Superman to ET, films have brought aliens to Earth as friends or enemies but, as yet, none has proved they have ever seen an alien apart from on film or TV.
In 1960, a radio telescope(电波望远镜) was pointed out into space to listen for signs of aliens, trying to add scientific fact to the question "Is anybody out there?" But 50 years on, nobody knows the answer to it.
"It's probably the most important question ," says Dr. Frank Drake, who was a pioneer of radio
astronomy. "What does it mean to be a human being? What is our future? Are there other creatures like us? What have they become? What can evolution（进化） produce? How far can it go? It will all come out of learning of aliens and this will certainly enrich our lives like nothing else could."
"We should be prepared" for aliens, says professor of space science John Zarnecki, from the Open University. Stephen Hawking says aliens almost certainly exist and senior astronomer Seth Shostak has said that the hunt for alien life should take into account alien "sentient（有感表的） machines", almost paying no attention to the possibility that there's nothing to search for.
But if there are aliens then the question is why haven’t we got any firm evidence of their existence? This was a question asked by the physicist Enrico Fermi as far back as 1950, saying “ where is everybody?”
But Dr. Drake has a more simple answer to why life hasn’t been found: “ We just haven’t tried enough,” he says. “We’ve looked carefully at only a few thousand stars and very few channels and that’s hardly even a start. There may be around 10,000 civilizations we can discover in the galaxy. That’s one in 10,000,000 stars. Before we have a good chance of succeeding, we still have a long way to go.”
32. The stories of Superman and ET are based on ________.
A. real events B. artists’ imagination
C. personal experiences D. scientists’ discoveries
33. Who doesn’t believe the existence of aliens?
A. Enrico Fermi. B. Dr. Frank Drake
C. John Zarnecki. D. Stephen Hawking
34. According to Dr. Frank Drake, we haven’t found aliens because________.
A. they are too far away from us B. we haven’t made enough efforts
C. they have never been to the earth D. our science isn’t developed enough
35. What can be inferred from the text?
A. Aliens have been seen by some people.
B. Aliens often appear in the films as enemies.
C. It remains a mystery whether there are aliens.
D. Scientists have studied millions of stars to search for aliens.