朗文英语听说教程一(5)

听说考试

Unit 7 are we alone

P：NASA recently recruit the astronaut to mars

S：why?

P：they found water on the planet so they want to seek intelligent life

S：Why do the scientist think there may be other intelligent life in the universe?

P：Because there 400 billion stars in our galaxies and 100 billion galaxies in the

universe ,other planet can probably support life similar to live on earth.Do you know the SETI project?

S：I know. Search for extraterrestrial Intelligent project。They use the radio telescopes to listen for radio signals from space we may locate other intelligent beings. What is the good factors for the radio signals？

P：A little. Radio signals travel quickly through space have a long range. They can travel long distances and not restricted to one area

S:by the way, Travel at the speed of light ,A radio signal takes 4 years to reach us from the nearest galaxy , Alpha Centauri,4.2 light years away

P：why not choose rocket? Tavel 10 miles per second . I t would take 60,000 years for a rocket to travel to us from the nearest galaxy

S：the other reason is that Rockets are restricted to travel in one direction

P：suppose oneday you receive the signal from alien you have been invited to their planet what kinds of gift you bring them

S：well ，guitar most multi-dimensional object

Greatest musical instruments conceived by own species

P：why？

S：1.sculptural object 2.signaling device 3.equipment for an acoustics What about you? P：DVD recorder or something else various of voices subjects languages etc

convey the basic information of our mankind