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 （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．

　　53．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

　　54．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

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