Which of the following may be the reason for humanity’s exploring? According to the passage, sending people to Mars is ______.

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问题 Which of the following may be the reason for humanity’s exploring?
According to the passage, sending people to Mars is ______.

选项 A、economically possible
B、technologically feasible
C、out of scientific incentive
D、all of the above

答案D

解析 本题是细节题,参见文章第3段,其大意是:把人类送入火星这一想法能打动那么多人的心,其原因之一是实施这一计划已经有了可能——美国已拥有完成此项计划所需的财力和基础技术等。更重要的是,最近的有关火星遥远过去的环境的发现为送人上火星提出了清楚的、令人信服的科学动机:寻找生命存在的证据。
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