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adaptive ability of humans would allow us to live on other plas. 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. 71. Why does the author mention the questions in Paragraph1? A. To express his doubts. B. To pare different ideas. C. To introduce points for discussion. D. To describe the conditions on Earth. 72. What is the reason for exploring space based on Paragraph2? 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. 73. The underlined word “spin offs” in Paragraph 4 probably refers to______. A. survival chances B. potential resources C. unexpected benefits D. physical possessions 74. What makes it possible for humans to live on other plas? A. Our geic makeup. B. Resources on the earth.. C. The adaptive ability of humans. D. Byproducts in space exploration. 75. 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. Can dogs and cats live in perfect harmony in the same home? People who are thinking about adopting a dog as a friend for their cats are worried that they will fight. A recen