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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 be 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 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 background 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 earth. Such a planet would be a reasonable distance from the star for temperatures to be right for the evolution（进化）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.
However, many scientists wonder whether intelligent（有智力的）life exists on other planets. Some believe that twenty years of searching without any intelligible messages shows that no one is out there. They say that the evolution of intelligence comparable to ours is unlikely.
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 civilization（文明）much more advanced than ours have developed. 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.
According to the passage, how many planets in our galaxy might be inhabitable?
A. 5 billion． B. 10 billion.
C. 15 billion. D. 200 billion
The first paragraph in this passage is mainly about ________ .
A. how scientists are looking for signs of life on other planets
B. why scientists are looking for signs of life on other planets
C. where scientists are looking for signs of life on other planets
D. when scientists are looking for signs of life on other planets
The underlined word “monitor” in the passage means“ ________ ”.
A. find B. follow
C. check D. form
Which of these statements is true based on the information in the passage?
A. The earth is one of the oldest planets in our galaxy.
B. Most scientists believe that there is intelligent life on other planets.
C. Scientists are trying different ways to find signs of life on other planets.
D. Scientists don’t believe that there might be life on other planets.
查看习题详情和答案>>On Easter Day 1722,some European explorers found a lonely island in the middle of the Pacific Ocean. They 1 it Easter Island. The explorers found that the island had good soil 2 the 200 natives living there survived with little food. Even more 3 , these people also lived among the ruins of what might have been a once great civilization. All that is left of it are around 800 giant stone statues 4 human heads. They 5 up to 270 tons and the tallest measures over 11 metres. The stone men face 6 , rather than out to sea, and their eyes are focused upon the sky. They are all carved from 7 volcanic rock (火山岩) and some have hats on their heads and eyes made from white coral. Since their 8 , these huge stone men 9 one of the greatest mysteries of all time. Who built them? Why did they do it? Some experts believe the stone men are 10 to Inca stonework, and suggest the figures were created by people of Peruvian descent (血统). 11 have even gone so far as to say that they came from outer space. The latest suggestion 12 the idea that Easter Island represents one of the worst cases of resource abuse in human history. It is said that a small group of Asians settled on Easter Island 13 between 400 and 700 AD. They developed a great civilization with huge forests and 14 food. At the peak of their civilization, the people began to build the giant 15 men. Why they did this is still 16 but it is possible the figures represent the settlers’ gods or ancestors. 17 the statues grew larger, the people’s lifestyles became more and more wasteful. The forest began to disappear, which 18 all the animals dying out. 19 couldn’t get food and were forced to eat other humans. Society began to 20 and the islanders themselves finally destroyed the stone men.
1. A. said B. were called C. named D. spoke
2. A. and B. but C. however D. still
3. A. surprise B. surprised C. surprising D. surprisingly
4. A. looking B. resembling C. liking D. standing for
5. A. weigh B. lift C. get D. measure
6. A. forward B. outward C. onward D. inward
7. A. broken B. soft C. hard D. burnt
8. A. looking B. invention C. discovery D. covering
9. A. have happened B. have led to C. have taken place D. have created
10. A. usual B. common C. familiar D. similar
11. A. Another B. Other C. Others D. Many
12. A. is focused on B. is based on C. is depended on D. is concentrated on
13. A. some day B. one day C. sometime D. once
14. A. plenty of B. number of C. much of D. amount of
15. A. clever B. stone C. wooden D. iron
16. A. welcome B. known C. unimportant D. unknown
17. A. While B. After C. With D. As
18. A. resulted in B. resulted from C. created D. lay in
19. A. The islands B. The people C. The animals D. The Europeans
20. A. break out B. break in C. break into D. break down
查看习题详情和答案>>
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 be trying to get in touch with us. Scientists also have sent radio and television messages on spaceships travelling through space, on the chance that someone may be receptive to such message.
Scientists are using powerful radio telescopes to listen to signals from about 1,000 stars, all within 100 light years of 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 channels at one 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 are like our sun. Perhaps half of them have a planet like Earth. Such a planet would be a reasonable distance from the star for temperatures to be right for the evolution (进化) 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.
However, many scientists wonder whether intelligent life exists on other planets. Some believe that twenty years of searching without any intelligible messages shows that no one is out there. They say that the evolution of intelligence comparable to ours is unlikely.
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 civilization much more advanced than ours have developed. 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.
64. According to the passage, how many planets in our galaxy might be inhabitable?
A. 5 billion B. 10 billion C. 15 billion D. 200 billion
65.. The first paragraph in this passage is mainly about _____.
A. how scientists are looking for signs of life on other planets
B. why scientists are looking for signs of life on other planets
C. where scientists are looking for signs of life on other planets
D. When scientists are looking for signs of life on other planets
66.. The underlined word “ monitor” in Paragraph 2 means “_______”.
A. find B. follow C. check D. form
67.. Which of the following is TRUE based on the information in the passage?
A. The earth is the oldest planet in our galaxy.
B. All scientists believe that there is intelligent life on other planets.
C. Scientists are trying different ways to find signs of life on other planets.
D. Scientists will give up the search for signs of life on other planets.
查看习题详情和答案>>On Easter Day 1722,some European explorers found a lonely island in the middle of the Pacific Ocean. They 1 it Easter Island. The explorers found that the island had good soil 2 the 200 natives living there survived with little food. Even more 3 , these people also lived among the ruins of what might have been a once great civilization. All that is left of it are around 800 giant stone statues 4 human heads. They 5 up to 270 tons and the tallest measures over 11 metres. The stone men face 6 , rather than out to sea, and their eyes are focused upon the sky. They are all carved from 7 volcanic rock (火山岩) and some have hats on their heads and eyes made from white coral. Since their 8 , these huge stone men 9 one of the greatest mysteries of all time. Who built them? Why did they do it? Some experts believe the stone men are 10 to Inca stonework, and suggest the figures were created by people of Peruvian descent (血统). 11 have even gone so far as to say that they came from outer space. The latest suggestion 12 the idea that Easter Island represents one of the worst cases of resource abuse in human history. It is said that a small group of Asians settled on Easter Island 13 between 400 and 700 AD. They developed a great civilization with huge forests and 14 food. At the peak of their civilization, the people began to build the giant 15 men. Why they did this is still 16 but it is possible the figures represent the settlers’ gods or ancestors. 17 the statues grew larger, the people’s lifestyles became more and more wasteful. The forest began to disappear, which 18 all the animals dying out. 19 couldn’t get food and were forced to eat other humans. Society began to 20 and the islanders themselves finally destroyed the stone men.
1. A. said B. were called C. named D. spoke
2. A. and B. but C. however D. still
3. A. surprise B. surprised C. surprising D. surprisingly
4. A. looking B. resembling C. liking D. standing for
5. A. weigh B. lift C. get D. measure
6. A. forward B. outward C. onward D. inward
7. A. broken B. soft C. hard D. burnt
8. A. looking B. invention C. discovery D. covering
9. A. have happened B. have led to C. have taken place D. have created
10. A. usual B. common C. familiar D. similar
11. A. Another B. Other C. Others D. Many
12. A. is focused on B. is based on C. is depended on D. is concentrated on
13. A. some day B. one day C. sometime D. once
14. A. plenty of B. number of C. much of D. amount of
15. A. clever B. stone C. wooden D. iron
16. A. welcome B. known C. unimportant D. unknown
17. A. While B. After C. With D. As
18. A. resulted in B. resulted from C. created D. lay in
19. A. The islands B. The people C. The animals D. The Europeans
20. A. break out B. break in C. break into D. break down
查看习题详情和答案>>
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 be trying to get in touch with us. Scientists also have sent radio and television messages on spaceships travelling through space, on the chance that someone may be receptive to such message.
Scientists are using powerful radio telescopes to listen to signals from about 1,000 stars, all within 100 light years of 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 channels at one 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 are like our sun. Perhaps half of them have a planet like Earth. Such a planet would be a reasonable distance from the star for temperatures to be right for the evolution (进化) 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.
However, many scientists wonder whether intelligent life exists on other planets. Some believe that twenty years of searching without any intelligible messages shows that no one is out there. They say that the evolution of intelligence comparable to ours is unlikely.
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 civilization much more advanced than ours have developed. 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.
64. According to the passage, how many planets in our galaxy might be inhabitable?
A. 5 billion B. 10 billion C. 15 billion D. 200 billion
65.. The first paragraph in this passage is mainly about _____.
A. how scientists are looking for signs of life on other planets
B. why scientists are looking for signs of life on other planets
C. where scientists are looking for signs of life on other planets
D. When scientists are looking for signs of life on other planets
66.. The underlined word “ monitor” in Paragraph 2 means “_______”.
A. find B. follow C. check D. form
67.. Which of the following is TRUE based on the information in the passage?
A. The earth is the oldest planet in our galaxy.
B. All scientists believe that there is intelligent life on other planets.
C. Scientists are trying different ways to find signs of life on other planets.
D. Scientists will give up the search for signs of life on other planets.
查看习题详情和答案>>