The following text is about space exploration.
NASA's Perseverance rover has been collecting rock samples on Mars since landing in 2021. These samples are stored in sealed tubes on the Martian surface, awaiting a future mission to retrieve them and return them to Earth. Scientists are particularly interested in rocks from an ancient river delta, which may contain evidence of past microbial life. If life ever existed on Mars, these samples could provide the first definitive proof.
What is the primary purpose of collecting Mars rock samples?
To study Martian soil for future farming
To search for evidence of past life on Mars
To find minerals for mining operations
To test the rover's mechanical capabilities
Correct Answer: B
Choice B is the correct answer. The text states scientists want rocks "which may contain evidence of past microbial life" and could provide "first definitive proof" of life.
- Evidence: Focus on river delta rocks that "may contain evidence of past microbial life."
- Reasoning: The stated goal is searching for signs of life.
- Conclusion: Finding evidence of past life is the main purpose.
Choice A is incorrect because farming is not mentioned. Choice C is incorrect because mining is not discussed. Choice D is incorrect because the rover's capabilities aren't the focus.