2. 外语
  3. According to the passage, the chief purpose of explorers in going to unknown places in the past was ______. The passage tells u

According to the passage, the chief purpose of explorers in going to unknown places in the past was ______. The passage tells u

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问题 According to the passage, the chief purpose of explorers in going to unknown places in the past was ______.
The passage tells us that proof of life on Mars would ______.
选项 A、make clear the complex chemistry in the development of life
B、confirm the suggestion that bacterial fossils travelled to Earth on a meteorite
C、reveal the kind of conditions under which life originates
D、provide an explanation why life is common in the universe
答案D
解析 由文章最后一句可知：如果能够证明生命独立地存在于火星和地球上，这一结果会对"宇宙中生命是普遍存在的"这一推测提供最早的具体线索。
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