The universe is a surprising place，and our existence within it is a wonder.If a long and unimaginably complex sequence of events dating back 4.6 billion years or so hadn’t happened in a particular manner at a particular time—if，to take just one example，the dinosaurs hadn’t been wiped out by a meteor(流星)—we might still be a few centimeters long，with whiskers(胡须)and a tail，and you’ll be reading this in a cave somewhere.

　　1．What’s the best title for this passage?

　　A．No Life Exists Out of the Earth

　　B．Seventy Planets Discovered

　　C．A Place Full of Wonders

　　D．Perfect Conditions for Life

　　答案　A

　　解析　标题归纳题。根据第一段中的“...it’s shocking to claim that completely no life exists elsewhere.”可知，在文章开头作者表达了自己的观点：除了地球之外其他星球上没有生命存在。下文主要围绕这个观点展开，所以A项作为标题最佳。

　　2．What makes the Earth more suitable for life than other planets in the solar system?

　　A．The Earth is the only planet that can receive energy from the sun.

　　B．The sun is at the right distance from us and in proper size.

　　C．The distance between the planets is neither too long nor too short.

　　D．The dinosaurs were no longer a threat to the Earth.

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