四级考试阅读主旨题解题技巧实战（21）_大学英语阅读

四级考试阅读主旨题解题技巧实战（21）

　　Through its research work, NASA has develop two means of systematically searching for E.T. life. The first method is to select the closest 800 stars like our sun and to direct a radio telescope to scan each of one them for electromagnetic wave. The second way is to survey the entire sky, listening for continuous signals which may come from extraterrestrial life. Scientists are looking in the 100-10,000 MegaHetz frequency range a range where there are fewer natural radio signals which could interfere with transmission . By looking signals in these specific regions, scientists can avoid any confusion that might be caused by receiving a natural radio signal rather than one sent by intelligent life.

　　NASA s search in space has already resulted in some discoveries including new equipment which may help in the development of new communication and medical technologies.

　　All this, as well as the chance of discovering, has made us feel confident that maybe we are not alone in the universe!

　　What is the main idea of the passage?

　　A Astronomers now feel certain that no life exists on the surface of any other planet in our solar system.

　　B It is realistic to send a spacecraft far beyond our solar system to search for E.T. life.

　　C There is no E.T. life on Mars.

　　D Using radio telescopes to listen out for message from E.T. life, scientists have discovered that the new equipment nay help in the development of new communication and medical technologies.