(题干同试题16)
Why was it hard to look for signs of intelligent life in the universe in the past?

• A.There were not any smaller planets.
• B.There were not any powerful telescopes.
• C.The astronomers were not interested in them.
• D.The Milky Way didn’t exist at that time,

答案

正确答案：B

知识点：细节理解题  

由第三段整体文意可知过去在宇宙中很难寻找到具有智力的生命的迹象是因为没有高倍望远镜。所以答案选B。

略

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