While many resources are spent on what seems a small return, the exploration of space allows creative, brave and intelligent members of our species to focus on what may serve to save us.While space may hold many wonders and explanations of how the universe was formed or how it works, it also holds dangers.The danger exists, but knowledge can help human beings to survive.Without the ability to reach out across space, the chance to save ourselves might not exist.

　　While Earth is the only planet known to support life, surely the adaptive ability of humans would allow us to live on other planets.It is true that the lifestyle would be different, but human life and cultures have adapted in the past and surely could in the future.

　　1．Why does the author mention the questions in Paragraph 1?

　　A．To express his doubts.

　　B．To compare different ideas.

　　C．To introduce points for discussion.

　　D．To describe the conditions on Earth.

　　2．What is the reason for exploring space based on Paragraph 2?

　　A．Humans are nature­born to do so.

　　B．Humans have the tendency to fight.

　　C．Humans may find new sources of food.

　　D．Humans don't like to stay in the same place.

　　3．The underlined word “spin­offs” in Paragraph 4 probably refers to________.

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