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Once found almost entirely in the western United States and in Asia, dinosaur fossils are now being discovered on all seven continents. A host of new revelations emerged in 1998 that promise to reshape scientists’ views of dinosaurs, including what they looked like and when and where they lived. It is doubtful that Tyrannosaurus Rex had lips or that Triceratops had cheeks, says Lawrence Witmer, an assistant professor of anatomy at Ohio University in Athens, Ohio. He reached its conclusions by using high-tech computerized axial tomography (CT or CAT) scans along with comparative anatomy studies. For example, the theory that Triceratops and similar dinosaur species had cheeks was based on past comparisons with mammals such as sheep. But Witmer’s careful analysis found the structure of the triceratops jaw and skull made it more likely that Triceratops had a beak like that of an eagle. Witmer said that scientists should use birds and crocodiles as models when researching the appearance of dinosaurs. In early October scientists announced that they had confirmed the discovery of a new type of ceratopsian dinosaur. The dinosaur’s bones, found in New Mexico in 1996, are forcing paleontologists to rethink their theories about when ceratopsians migrated to what is now North America. Scientists previously thought that ceratopsians, the group that included the well-known Triceratops. arrived in North America from Asia between 70 million and 80 million years ago. During this time, the late Cretaceous Period. the earth’s two supercontinents—Laurasia in the north and Gondwanaland in the south—were in the process of pulling apart, cutting dinosaur populations off from each other and interrupting migratory patterns. The fossilized bones, found by paleontologist Doug Wolfe of the Mesa Southwest Museum in Arizona, date to about 90 million yeses ago. This could mean that ceratopsians originated in North America and migrated to Asia rather than the reverse, paleontologists said. An expedition from the Universities of Alaska in Anchorage and Fairbanks has discovered a region in remote northern Alaska so rich in fossilized dinosaur tracks that team members dubbed it the "dino expressway". The trampled area was found during the summer of 1998 on Alaska’s North Slope near the Brooks Range. The team found 13 new track sites and made casts from the prints of five different types of dinosaurs. The rock in which the prints were found dates to more than 100 million years ago, or about 25 million years older than the previously discovered signs of dinosaurs in the Arctic region. Paleontologists said that the new findings provide important evidence that dinosaurs migrated between Asia and North America during the early and mid-Cretaceous Period. before Asia split off into its own continent. Two rich fossil sites in the hills of Bolivia have been recently discovered, exciting paleontologists and dinosaur buffs. This discovery includes one of the most spectacular dinosaur trackways ever found. The discovery of a large site in the mountain region of Kila Kila in southern Bolivia was announced in early October. Here scientists found the tracks of at least two unknown species of dinosaur. These included a large quadruped (four. footed) dinosaur that was probably about 20 m (about 70 ft) long. The other site, located not far from the Bolivian city of Sucre, was uncovered in a cement quarry by workers several years ago but was not brought to paleontologists’ attention until the middle of 1998. The site features a vertical wall covered with thousands of dinosaur prints representing more than 100 different species. The tracks date back to between 65 million and 70 million years ago. Since dinosaurs are believed to have died out around 65 million years ago, the prints were likely made by some of the last dinosaurs on earth. Paleontologists hope to study the site and learn about the diet and physical characteristics of the dinosaurs that are represented there.
A．migrated to North America around 70—80 million years agoB．arrived in Asia from North America about 90 million years agoC．originated in Asia and later migrated to North AmericaD．could have moved to Asia from North America long ago
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节流阀属于（）。
A、方向控制阀
B、压力控制阀
C、流量控制阀
D、流速控制阀
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ARL4460、BAIRD-DV6、ARL-MA光谱仪的分光系统处于（）环境下。
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多根多处肋骨骨折因反常呼吸导致呼吸困难时，主要措施是（）
A.肋间神经阻滞及骨折处封闭
B.胸腔闭式引流
C.控制输入液体量以防肺水肿
D.牵引固定胸壁
E.使用呼吸兴奋剂
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关于流速讨论，下面哪个描述是错误的？（）
A.对于单一管道内的流体稳定流动，管子越细，流速越慢B.江、河河道较宽之处，河流缓慢C.江、河河道狭窄之处，河流湍急D.对于单一管道内的流体稳定流动，管子越粗，流速越慢
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某储户2004年2月5日存入定期1年的储蓄存款1200元，于2005年3月10日来行支取。支取日活期存款利率为0.72%。 利息= 税金
A.72%。
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现阶段人民政协履行职能围绕的两大主题是民主和( )
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完全信息静态博弈对应以下哪项均衡？（）
A.纳什均衡
B.子博弈精炼纳什均衡
C.贝叶斯纳什均衡
D.精炼贝叶斯纳什均衡
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被计量的电源是0.45A，为使计量结果更准确些，应选下列电流表中的（）。
A.上量限为5A的0.1级电流表 B.上量限为5A的0.5级电流表 C.上量限为2A的0.2级电流表
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49、患者,男,55岁。慢性肾小球肾炎10年,1周前受凉后出现食欲减退、恶心、呕吐,晨起最明显,夜尿增多。内生肌酐清除率为35ml/min。患者饮食中蛋白质的选择正确的是 ()
A . 大量动物蛋白B . 大量植物蛋白C . 少量动物蛋白D . 少量植物蛋白E . 禁食蛋白质
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成功的跨文化谈判应当尽可能挖掘文化差异中的整合机会。()
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以下关于麻风的描述错误的是（）。
A.可以预防
B.不可治愈
C.侵犯皮肤粘膜和周围神经
D.可致残、致畸
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（）中记载了医政机构的设置，其中医师总管医药行政。
A.《山海经》B.《论语》C.《周礼》D.《诗经》E.《礼记》
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AGP插槽是（）的专用插槽。
A. 声卡B. 显卡C. 网卡D. 视频转接卡
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