[单项选择]{{B}}Passage 4{{/B}}

The fossil remains of the first flying vertebrates, the pterosaurs. have intrigued paleontologists for more than two centuries, How such large creatures, which weighed in some eases as much as a piloted hang-glider and had wingspans from 8 to 12 meters, solved the problems of powered flight, and exactly what these creatures were — reptiles or birds — are among the questions scientists have puzzled over. Perhaps the least controversial assertion about the pterosaurs is that they were reptiles. Their skulls, pelvises, and hind feet are reptilian. The anatomy of their wings suggests that they did not evolve into the class of birds. In pterosaurs a greatly elongated fourth finger of each forelimb supported a wing like membrane. The other fingers were short and reptilian, with sharp claws. In birds the second finger is the prin A. revolutionary B. unlikely C. unassailable D. probable 查看答案 更多"{{B}}Passage 4{{/B}} Th"的相关试题: [单项选择]{{B}}Passage 4{{/B}} The fossil remains of the first flying vertebrates, the pterosaurs. have intrigued paleontologists for more than two centuries, How such large creatures, which weighed in some eases as much as a piloted hang-glider and had wingspans from 8 to 12 meters, solved the problems of powered flight, and exactly what these creatures were — reptiles or birds — are among the questions scientists have puzzled over. Perhaps the least controversial assertion about the pterosaurs is that they were reptiles. Their skulls, pelvises, and hind feet are reptilian. The anatomy of their wings suggests that they did not evolve into the class of birds. In pterosaurs a greatly elongated fourth finger of each forelimb supported a wing like membrane. The other fingers were short and reptilian, with sharp claws. In birds the second finger is the prin A. enormous wingspans of the pterosaurs enabled them to fly great distances B. structure of the skeleton of the pterosaurs suggests a close evolutionary relationship to hats C. fossil remains of the pterosaurs reveal how they solved the problem of powered flight D. pterosaurs were reptiles 查看答案 [简答题]Passage One How to Get Preserved as a Fossil There are several ways into which animals and plants may become fossilized. 查看答案 [简答题]Passage One How to Get Preserved as a Fossil Unfortunately the changes of any animal become a fossil are not very great, and 查看答案 [简答题]Passage One How to Get Preserved as a Fossil It is not surprising that all the millions of animals that have lived in the past. 查看答案 [单项选择]{{B}}Passage B{{/B}} Questions 25 to 30 are based on the passage you have just heard. A. 9:00 to 10:00. B. 9:00 to 10:30. C. 9:30 to 11:00. D. 9:30 to 11:30. 查看答案 [填空题]{{B}}Section B{{/B}} Passage One {{B}} Questions 52 to 56 are based on the following passage.{{/B}} BRITAIN’S universities are in an awful spin. Top universities were overwhelmed by the 24% of A-level applicants with indistinguishable straight As newer ones are beating the byways for bodies. Curiously, both images of education—the weeping willows of Cambridge and the futuristic architecture of UEL—are cherished by the government. Ministers want to see half of all young people in universities by 2010 (numbers have stalled at 42%), without letting go of the world-class quality of its top institutions. Many argue that the two goals are incompatible without spending a lot more money. Re searchers scrabble for funds, and students complain of large classes and reduced teaching time. To help solve the problem, the government agreed in 2 A. A．They are confident of changing it. B．They are much disturbed by it. C．They find it natural in the market. D．They cherish it with a nostalgic mood. 查看答案 我来回答: 提交 最新试题 ●    [多选题]反映银行经营绩效的主要财务指标有( )。 ●    [单选题]选择錾子楔角时，在保证足够强度的前提下，尽量取(　　)数值。 ●    [判断题] ( ) 机车乘务制度实行包乘制。机车乘务制度由铁路局确定。 ●    [简答题]35.     在四杆机构中，可利用加飞轮的方法来克服它的死点。 ●    [单选题]1.38 驾驶机动车通过漫水桥,停车观察水情确认安全后,怎样通过? ●    [单选题]消防安全腰带的设计负荷为(),其质量不超过0.85kg。 网站地图 我要搜题网  版权所有  ©2023  湘ICP备18016427号   购买搜题卡查看答案 [会员特权] 开通VIP， 查看 全部题目答案 [会员特权] 享免全部广告特权 推荐91天 ¥36.8 ￥80元 31天 ¥20.8 ￥40元 365天 ¥88.8 ￥188元 请选择支付方式 微信支付 支付宝支付 点击支付即表示同意并接受了《购买须知》 立即支付 系统将自动为您注册账号 已有账号登录 找回账号密码 请使用微信扫码支付 订单号： 请不要关闭本页面，支付完成后请点击【支付完成】按钮 支付完成 取消支付 恭喜您，购买搜题卡成功 系统为您生成的账号密码如下： 账号 密码 重要提示：请拍照或截图保存账号密码！ 我要搜题网官网：https://www.woyaosouti.com 我已记住账号密码