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  3. "Two centuries ago, Meriwether Lewis and William Clark left St. Lois to explore the new lands acquired in the Louisiana Purchase

"Two centuries ago, Meriwether Lewis and William Clark left St. Lois to explore the new lands acquired in the Louisiana Purchase

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问题     "Two centuries ago, Meriwether Lewis and William Clark left St. Lois to explore the new lands acquired in the Louisiana Purchase, " George W. Bush said, announcing his desire for a program to send men and women to Mars. "They made that journey in the spirit of discovery... America has ventured forth into space for the same reasons. "
    Yet there are vital differences between Lewis and Clark’s expedition and a Mars mission. First, Lewis and Clark were headed to a place amenable to life; hundreds of thousands of people were already living there. Second, Lewis and Clark were certain to discover places and things of immediate value to the new nation. Third, the Lewis and Clark venture cost next to nothing by today’s standards. In 1989, NASA estimated that a people-to-Mars program would cost $ 400 billion, which inflates to $ 600 billion today. But the fact that a destination is tantalizing does not mean the journey makes sense, even considering the human calling to explore. And Mars as a destination for people makes absolutely no sense with current technology.
    Present systems for getting from Earth’s surface to low-Earth orbit are so fantastically expensive that merely launching the 1, 000 tons or so of spacecraft and equipment a Mars mission would require could be accomplished only by cutting health-care benefits, education spending or other important programs or by raising taxes. Absent some remarkable discovery, astronauts, geologists and biologists once on Mars could do little more than analyze rocks and feel awestruck beholding the sky of another world.
    It is interesting to note that when President Bush unveiled his proposal, he listed these recent major achievements of space exploration: pictures of the rings of Saturn and the outer planets, evidence of water on Mars and the moon of Jupiter, discovery of more than 100 planets outside our solar system and study of the soil of Mars. All these accomplishments came from automated probes or automated space telescopes. Bush’s proposal, which calls for "reprogramming" some of NASA’s present budget into the Mars effort, might actually lead to a reduction in such unmanned science, the one aspect of space exploration that’s working really well.
    Rather than spend hundreds of billions of dollars to hurl tons toward Mars using current technology, why not take a decade or two decades, or however much time is required researching new launch systems and advanced propulsion? If new launch systems could put weight into orbit affordably, and if advanced propulsion could speed up that long, slow transit to Mars, then the dreams of stepping onto the Red Planet might become reality. Mars will still be there when the technology is ready.
    The drive to explore is part of what makes us human, and exploration of the past has led to unexpected glories. Dreams must be tempered by realism, however. For the moment, going to Mars is hopelessly unrealistic.
Bush’s citing of the achievements of space exploration is mentioned
选项 A、to show unmanned science will be much affected by manned space travel.
B、to demonstrate the reprogramming of NASA’s budget into Mars effort is affordable.
C、to display accomplishments will be made by automated probes.
D、to stress space exploration is and will always be America’s first priority.
答案A
解析 事实细节题。文章第四段，布什列举了一些探索火星所达到的成就。在介绍完这些成就之后，作者提到“所有这些都是通过自动探测仪和自动太空望远镜发现的”，接着又发表观点说布什的提议会导致目前十分有效的不载人航天科学的开支缩减。可见，作者提到布什列举的例子，目的是在证明火星计划会影响目前不载人的航天科学。本题答案为[A]。[B]的观点并未在原文提及；[C]项的will be与文章中的“已经取得的探索成果”相悖；[D]属于绝对表述，且与作者观点完全相反。
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