新东方在线网络课堂 职称英语 新东方在线 > 职称英语 > 职称英语理工类 > 阅读理解 > 正文

2017年职称英语考试理工B级阅读理解练习(1)

2017-01-03 09:00:00 来源:新东方在线发表评论

2017年职称英语辅导班热招中 免费赠教材词典

2017年职称英语考试理工B级阅读理解练习

Winged Robot Learns to Fly

  Learning how to fly took nature millions of years of trial and error—but a winged robot has cracked it in only a few hours, using the same evolutionary principles.

  Krister Wolff and Peter Nordin of Chalmers University of Technology (CUT) in Gothenburg, Sweden, built a winged robot and set about testing whether it could learn to fly by itself, without any pre-programmed data on what flapping is or how to do it.

  To begin with, the robot just twitched and jerked erratically. But, gradually, it made movements that gained height. At first , it cheated — simply standing on its wing tips was one early short cut. After three hours, however, the robot abandoned such methods in favor of a more effective flapping technique, where it rotated its wings through 90 degrees and raised them before twisting them back to the horizontal and pushing down.

  “This tells us that this kind of evolution is capable of coming up with flying motion,” says Peter Bentley, who works on evolutionary computing at University College London. But while the robot had worked out how best to produce lift, it was not about to take off. “There’s only so much that evolution can do, Bentley says. This thing is never going to fly because the motors will never have the strength to do it,” he says.

  The robot had metre-long wings made from balsa wood and covered with a light plastic film. Small motors on the robot let it move its wings forwards or backwards, up or down or twist them in either direction.

  The team attached the robot to two vertical rods, so it could slide up and down. At the start of a test, the robot was suspended by an elastic band. A movement detector measured how much lift, if any, the robot produced for any given movement.

  A computer program fed the robot random instructions, at the rate of 20 per second, to test its flapping abilities. Each instruction told the robot either to do nothing or to move the wings slightly in the various directions.

  Feedback from the movement detector let the program work out which sets of instructions were best at producing lift. The most successful ones were paired up and “offspring” sets of instructions were generated by swapping instructions randomly between successful pairs. These next-generation instructions were then sent to the robot and evaluated before breeding a new generation, and the process was repeated.

  1.Which of the following is NOT true of what is mentioned about the winged robot in the second paragraph?

  A. The two professors of CUT built the winged robot.

  B. The two professors of CUT tested whether the winged robot could learn to fly.

  C. The two professors of CUT programmed the data on how the robot flapped its wings.

  D. The two professors of CUT tried to find out if the robot could fly by itself.

  2.How did the robot behave at the beginning of the test?

  A. It rotated its wings through 90 degrees.

  B. It twitched but gradually gained height.

  C. It was twitched and broke down.

  D. It landed not long after the test.

  3.Which of the following is nearest to Peter Bentley’s view on the winged robot?

  A. The winged robot could never really fly.

  B. The winged robot did not have a mortor.

  C. The winged robot should go through further evolution before it could fly.

  D. The robot could fly if it were lighter.

  4.What measured how much lift the robot produced?

  A. Two vertical rods. B. A movement detector.

  C. An elastic band. D. Both B and C.

  5.What does “the process” appearing in the last paragraph refer to?

  A. Pairing up successful instructions.

  B. Sending instructions to the robot.

  C. Generating new sets of instructions for evaluation.

  D. All the above.

来源:新东方在线论坛

本文关键字: 2017年职称英语考试 理工B级 阅读理解 练习

分享到:

课程试听换一换

相关推荐

微博关注

版权及免责声明

1,"新东方在线"上的内容,包括文章、资料、资讯等, 本网注明"稿件来源:新东方在线"的,其版权 均为"新东方在线"或北京新东方迅程网络科技有限公司所有 ,任何公司、媒体、网站或个人未经授权不得转载、链接、转贴或以其他方式使用。已经得到 "新东方在线"许可 的媒体、网站,在使用时必须注明"稿件来源:新东方",违者本网站将依法追究责任。

2, "新东方在线" 未注明"稿件来源:新东方"的 文章、资料、资讯等 均为转载稿,本网站转载出于传递更多信息之目的,并不意味着赞同其观点或证实其内容的真实性。如其他媒体、网站或个人从本网站下载使用,必须保留本网站注明的"稿件来源",并自负版权等法律责任。如擅自篡改为 " 稿件来源:新东方 " ,本网站将依法追究其法律责任。

3,如本网转载稿涉及版权等问题,请作者见稿后在两周内与新东方在线联系。

  • 2017职称英语直播答疑
  • 2017年职称英语考试辅导课程

热点资讯更多>>

实用 • 工具

交流 • 下载

  • 职称英语备考资料下载
  • 职称英语备考资料下载
  • 职称英语备考资料下载
  • 职称英语复习必备

课程排行榜本周本月

公开课更多>>

2017职称英语改编题串讲 w 44分35秒
1 2017职称英语改编题串讲
2017职称英语阅读理解答题技巧 w 26分32秒
2 2017职称英语阅读理解答题技巧
2017职称英语完形填空答题技巧提炼 w 33分35秒
3 2017职称英语完形填空答题技巧提炼
2017职称英语通关中英文朗读篇 w 05分13秒
4 2017职称英语通关中英文朗读篇
2017年职称英语语法考点重点解析 w 21分17秒
5 2017年职称英语语法考点重点解析

新东方在线职称英语更多>>

推荐阅读