2. 外语
  3. According to the passage, the chief purpose of explorers in going to unknown places in the past was______. By saying "With Mars

According to the passage, the chief purpose of explorers in going to unknown places in the past was______. By saying "With Mars

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问题 According to the passage, the chief purpose of explorers in going to unknown places in the past was______.
By saying "With Mars the scientific stakes are arguably higher than they have ever been" (Line 1, Para.4), the author means that______.
选项 A、with Mars the risks involved are much greater than any previous space ventures
B、in the case of Mars, the rewards of scientific exploration can be very high
C、in the case of Mars, much more research funds are needed than ever before
D、with Mars, scientists argue, the fundamental interests of science are at issue
答案B
解析 关键词理解题。stake在英语中有“回报；奖金”的意思。这句话是第四段的主题句，后面讲到证明火星上有生命存在或存在过，可以让我们了解生命起源所需的条件。如果进一步证明火星上的生命是独立产生的话，那么就可以揭开一个谜，即“宇宙中是否普遍存在生命”。由此可以看出，火星探索在科学上的回报可能是非常大的，可以帮助我们了解很多基础的东西。所以选 B。第四段并非讲火星探索的危险，所以A项不对。
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