3 . 阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
Are we alone in the universe? Scientists have spent years 1 (search) deep into space for signs of life beyond our planet. Now they’ve discovered what might be life on Venus.
Venus is the second planet from the sun in our solar system. It’s one of the brightest 2 (object) in the night sky. Several billion years ago, the surfaces of Venus and Earth may have been more similar 3 now. But today, the surface of Venus is too hot for life. And until recently, Venus’s thick clouds were thought to be too poisonous for a living thing 4 (survive) there.
5 September 14, in the journal Nature Astronomy, scientists reported the discovery of a chemical 6 (call) phosphine(磷化氢 ) in the clouds of Venus. On Earth, phosphine gas 7 (give) off by living things. Scientists aren’t yet able to prove that life on Venus is 8 is producing the phosphine. But they can’t explain the source of the gas in any other way.
The discovery of life beyond Earth would teach us more about the universe 9 our place in it. To Sousa-Silva, Harvard University astrochemist, it would say something about our 10 (important). “I like finding out that we as humans aren’t that special,” she says.
