B.It can be useful but harmful.
C.It can make you feel at ease.
D.It is popular in the world.
52.From the passage we can conclude that plastic surgery and Rotox ______.
A.help reduce wrinkles
B.are good for women's health
C.will be replaced by facial yoga
D.are natural ways to keep young
D
For more than twenty years scientists have been searching for signs of life on other planets.Most of these searches have been done over the radio.The hope is that someone in outer space may he trying to get in touch with us.Scientists also have sent radio and television messages on spaceships traveling through space, on the chance that someone may be receptive to such messages.
Scientists are using powerful radio telescopes (望远镜) to listen to signals from about 1,000 stars, all within 100 light years of earth.In addition, they will scan (扫视) the entire sky to "listen" for radio messages from more distant stars.Using a computer, they will be able to monitor more than eight channels at one time.Scientists are looking for any signal they stands out from the hack-ground noise.
Of the 200 billion stars in the Milky Way galaxy (银河星系), scientists find that five percent are like our sun.Perhaps half of them have a planet like our earth.Such a planet would be a reasonable distance from the star for temperatures to be right for the evolution of life.Based on the inhabitable( that can be lived in) planets in our galaxy, most scientists agree that chances are likely that one or more of these planets support some life.
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