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Galileo first ______1_____ Saturn’s rings 400 years ago. But since then, scientists have ______2_____ how they got there. Because the rings are almost pure water ice—and material in the outer s...
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Hints: Robert Gates Park Seung-jae U.S. Defense Secretary Robert Gates is also downplaying military action. He says the United States would only attempt to shoot down the rocket in the unlikel...
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韩国和美国的领导人都基本上排除了利用军事手段来干预北朝鲜据信几天之内就要发射远程火箭的举动。目前各方都在观望,看日本是否要按照既定计划,把北朝鲜火箭击落。Hints: Seoul Pyongyang Lee Myung-bak A...