2. 外语
  3. Meteorite explosions in the Earth’s atmosphere as large as the one that destroyed forests in Siberia, with approximately the for

Meteorite explosions in the Earth’s atmosphere as large as the one that destroyed forests in Siberia, with approximately the for

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问题 Meteorite explosions in the Earth’s atmosphere as large as the one that destroyed forests in Siberia, with approximately the force of a twelve-megaton nuclear blast, occur about once a century. The response of highly automated systems controlled by complex computer programs to unexpected circumstances is unpredictable. Which of the following conclusions can most properly be drawn, if the statements above are true, about a highly automated nuclear-missile defense system controlled by a complex computer program?
选项 A、Within a century after its construction, the system would react inappropriately and might accidentally start a nuclear war.
B、The system would be destroyed if an explosion of a large meteorite occurred in the Earth’s atmosphere.
C、It would be impossible for the system to distinguish the explosion of a large meteorite from the explosion of a nuclear weapon.
D、Whether the system would respond inappropriately to the explosion of a large meteorite would depend on the location of the blast.
E、It is not certain what the system’s response to the explosion of a large meteorite would be, if its designers did not plan for such a contingency.
答案E
解析 归纳题应着重把握层次结构。如果该防御系统的设计者没有考虑到大陨石爆炸这种偶然性，这种爆炸，从该系统来看，是一种未预料的情况，该系统对这种爆炸的反应相应是无法预测的，选项(E)表述了这种推理，因而是正确答案；无法推出选项(A)和(C)，因为一个世纪内没有陨石爆炸发生和一个经过合理设计的核防御系统能够区分核爆炸和陨石爆炸同所提供的信息不矛盾；无法推出选项(B)和(D)，因为既没有信息表明大气层中的陨石爆炸会摧毁该系统，也没有信息表明爆炸发生的位置将决定该防御系统的反应是否适当。
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