题目内容
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Five other planets ______.
A．always appear near the path of the sun
B．are moving in a way more complicated than the earth does
C．aren't moving around the sun as independently as the earth does
D．are moving around the san at the same speed as the earth does
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All the other five planets ________.
[A] always appear near the path of the sun
[B] are moving in a way more complicated than the earth does
[C] aren't moving around the sun as independently as the earth does
[D] are moving around the sun at the same speed as the earth does
According to the last paragraph, five other planets
A．always appear near the path of the sun.
B．aren’t moving around the sun as independently as the earth does.
C．are moving in a way that can not be recognized.
D．are moving around the sun at the same speed as the earth does.
Scientists are using powerful radio telescopes to "listen" to signals from about 1,000 stars, all within 100 light years of the earth. In addition, they will scan the entire sky to listen for radio messages from more distant stars. Using a computer, they will be able to monitor more than eight million channels at a time. Scientists are looking for any signal that stands out from the background noise.
Of the 200 billion stars in the Milky Way galaxy, scientists find that five percent of the stars are like our sun. Perhaps half of them have a planet like the earth. Such a planet would be a reasonable distance from the star for the temperatures to be right for the evolution of life. Believing that there are the inhabitable (that can be lived in) planets in our galaxy, most scientists agree that chances are that one or more of these planets support some life.
However, many scientists wonder whether intelligent life exists on other planets. Some believe that thirty years of searching without any intelligent messages show that no one is out there. They say that the evolution of intelligence comparable to ours is unlikely.
(44) Other scientists believe that our search hasn't been long enough to rule out the possibility that intelligent life exists in our galaxy. Although our sun family is only about five billion years old, our galaxy is about 20 billion years old. In that time some scientists think it is likely that civilizations are much more advanced than ours. Perhaps these civilizations send us no signals; perhaps we have not recognized the signals they have sent us. If we hope to find intelligent life, these scientists believe that we have to keep looking.
To look for signals from distant stars, scientists______.
A．have sent up spaceships to other planets
B．have sent radio and television messages to outer space
C．are listening to the radio message all the year round
D．will use computers to pick up background noise
Who began to call the days in a week after five planets, the sun and the moon？
A．The Egyptians.
B．The Romans.
C．The Babylonians.
D．The Anglo - Saxons.
A.Perhaps people will is able to live on other planets
B.Perhaps people will can live on other planets
C.Perhaps people will be able to live on other planets
So far there is no proof ______ spaceships from other planets do exist．
A．which
B．that
C．how
D．what
So far there is no proof______people from other planets do exist.
A．which
B．that
C．what
D．how
It is difficult to send people to other planets because of ______.
A．lack of capacity of space exploration vehicles.
B．the financial expenditure involved in space travel.
C．controversial nature of space travel.
D．the uncertain future of space exploration.
A．make war
B．communicate
C．settle clown
D．explore
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