题目

NASA's Perseverance rover (火星车) continues its pioneering exploration of Mars' Jezero Crater, collecting rock samples that may fundamentally change our understanding of the Red Planet and the potential for life outside the earth. Since landing in 2021, the car-sized rover has been carefully documenting Mars' geology while gathering sealed samples for eventual return to Earth.Scientists believe Mars was once a mild world with flowing water and a protective magnetic field (磁场), which was suitable for the survival of living things. "Around three billion years ago, something disastrous happened," explains Ken Farley, Perseverance's project scientist. "The planet's magnetic field disappeared, solar wind took away the atmosphere forcefully, and Mars became the uninhabitable world we see today."Perseverance's primary mission is to search for signs of ancient tiny living organisms. The rover is equipped with precise instruments to analyze rocks and soil, but its most important task is collecting pure and undamaged samples for detailed study on Earth. "Each sample tube we fill could hold answers to questions about Martian history and whether life ever existed there," says Meenakshi Wadhwa, lead scientist for the Mars Sample Return program.In June 2024, NASA's Curiosity rover discovered yellow sulfur crystals — an exciting find. However, only Perseverance can collect samples for return to Earth, making its mission uniquely valuable.The ambitious Mars Sample Return program, a cooperation between NASA and ESA, aims to retrieve these samples by the early 2030s. The process involves multiple spacecraft working in sequence to launch the samples from Mars' surface and safely deliver them to Earth. Once here, scientists worldwide will study them using advanced laboratory techniques unavailable on the rover itself."These samples may hold clues not just about Mars, but about how planets evolve and how life begins," Wadhwa emphasizes. As Perseverance continues its journey across the Martian landscape, each new discovery brings humanity closer to answering one of our most profound questions: Are we alone in the universe? （1） What was Mars like before the disaster? A . Dry. B . Noisy. C . Freezing. D . Inhabitable. （2） What is the main mission of NASA's Perseverance rover? A . To seek evidence of early life signs on Mars. B . To test new spacecraft landing technologies. C . To study the Martian atmosphere composition. D . To document the Martian surface temperature. （3） What does the underlined word "retrieve" in paragraph 5 probably mean? A . Look into. B . Get back. C . Set aside. D . Pay off. （4） What is the follow-up research most likely to focus on? A . New instruments for other missions. B . Deep analyses of the Mars' samples. C . Test methods for restoring magnetic field. D . Spacecraft designs for longer space travel. 答案： D A B B

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