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.

　　16. 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.

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

　　A. Humans are nature-born 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.

　　18. The underlined word “spin-offs” in Paragraph 4 probably refers to______.

　　A. survival chances

　　B. unexpected benefits

　　C. potential resources

　　D. physical possessions

　　19. What makes it possible for humans to live on other planets?

　　A. The adaptive ability of humans.

　　B. Resources on the earth..

　　C. Our genetic makeup.

　　D. By-products in space exploration.

　　20. Which of the statements can best sum up the passage?

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