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?
A. Space exploration has created many wonders.
B. Space exploration provided the best value for money.
C. Space exploration can benefit science and technology.
D. Space exploration may help us avoid potential problems on Earth.
【参考答案16--20】C A B A D
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