1. 题干：Assumptions underlying the search for extra-terrestrial intelligence(C9-T1-R1 T14)
原文：In discussing whether we are alone, most SETI scientists adopt two ground rules.
同义替换：
Two ground rules --- assumptions
Search for extra- terrestrial intelligence --- whether we are alone
2. 题干：Likelihood of life on other planets
(C9-T1-R1 T15)
原文：…estimate that perhaps one in 100,000 stars might have a life-bearing planet orbiting it.
同义替换：
Likelihood --- estimate…perhaps
Life on other planets --- a life-bearing planet
3. 题干：Seeking the transmission of radio signals from planets(C9-T1-R2 T16)
原文：It turns out that, for a given amount of transmitted power, radio waves in the frequency rang 1000 to 3000 MHZ travel the greatest distance, and so all searches to date have concentrated on looking for radio waves in this frequency range.
同义替换：
Seeking --- looking for
Radio signals --- radio waves
4. 题干：Appropriate responses to signals from other civilizations(C9-T1-R2 T17)
原文：There is considerable debate over how we should react if we detect a signal form an alien civilization.
同义替换：
Responses --- react
Other civilizations --- an alien civilization
5. 题干：What is the life expectancy of Earth?(C9-T1-R2 T18)
原文：Since the lifetime of a planet like ours is several billion years, we can expect that, if other civilizations do survive in our galaxy.
同义替换：
Life expectancy --- lifetime
Earth --- a planet like ours
6. 题干：What kind of signals from other intelligent civilization are SETI scientists searching for?(C9-T1-R2 T19)
原文：An alien civilization could choose many different ways of sending information across the galaxy, but many of these either require too much energy, or else are severely attenuated while traversing the vast distances across the galaxy. It turns out that, for a given amount of transmitted power, radio waves in the frequency rang 1000 to 3000 MHZ travel the greatest distance, and so all searches to date have concentrated on looking for radio waves in this frequency range.
同义替换：
Searching for --- looking for
7. 题干：How many stars are the world’s most powerful radio telescopes searching?(C9-T1-R2 T20)
原文：One part is targeted search using the world’s largest radio telescopes, the American-operated telescope in Arecibo, Puerto Rico and the French telescope in Nancy in France. This part of the project is searching the nearest 1000 likely stars with high sensitivity for signals in the frequency range 1000 to 3000 MHz.
同义替换：
Powerful --- largest
8. 题干：Alien civilizations may be able to help the human race to overcome serious problems. (C9-T1-R2 T21)
原文：It is even possible that the older civilization may pass on the benefits of their experience in dealing with threats to survival such as nuclear war and global pollution, and other threats that we haven’t yet discovered
同义替换：
Alien civilizations --- the older civilization
Help --- pass on the benefit of…
Overcome --- dealing with
Serious problems --- threats ...such as nuclear war…
9. 题干：SETI scientists are trying to find a life form that resembles humans in many ways.(C9-T1-R2 T22)
原文：Second, we make a very conservative assumption that we are looking for a life form that is pretty well like us.
同义替换：
Resemble --- like
10. 题干：The Americans and Australians have co-operated on joint research projects.(C9-T1-R2 T23)
原文：So far there have been a number of searches by various groups around the world, including Australian searches using the radio telescope at Parkes, New South Wales.
同义替换：
A number of searches --- research projects
11. 题干：So far SETI scientists have picked up radio signals from several stars. (C9-T1-R2 T24)
原文：Until now there have not been any detections from the few hundred stars which have been searched.
同义替换:
So far --- until now
Picked up radio signals --- any detections
Several --- few hundred
12. 题干：The NASA project attracted criticism from some members of Congress.(C9-T1-R2 T25)
原文：The scale of the searches has been increased dramatically since 1992, when the US congress voted NASA $10 million per year for ten years to conduct a thorough search for extra-terrestrial life.
同义替换：
The US congress --- some members of Congress
13. 题干：If a signal from outer space is received, it will be important to respond promptly.(C9-T1-R2 T26)
原文：There is considerable debate over how we should react if we detect a signal from an alien civilization. Everybody agrees that we should not reply immediately.
同义替换：
React --- reply
Outer space --- an alien civilization
Promptly --- immediately
