2. 外语
  3. According to the passage, the chief purpose of explorers in going to unknown places in the past was ______. At present, a proba

According to the passage, the chief purpose of explorers in going to unknown places in the past was ______. At present, a proba

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问题 According to the passage, the chief purpose of explorers in going to unknown places in the past was ______.
At present, a probable inducement for countries to initiate large-scale space ventures is ______.
选项 A、international cooperation
B、scientific research
C、nationalistic reasons
D、long-term profits
答案B
解析 分析推理题。短文第三段指出，火星是如今人类的下一个伟大的未知世界．除了经济或国家利益，人类显然还有别的动机去探索火星。然后作者用问句表明了自己的观点：是否以前在探索中起次要作用的科学，注定要在如今的探索活动中起主要作用?这也就是说，如今许多国家进行大范围空间探索的动机已经变成了科学研究。
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