题目内容
The invention of both labor-saving tools and tools of intelligence is rarely accidental. Instead, it is usually the product of human need; (1) is truly the mother of invention. People usually devise tools to (2) for natural deficiencies. For example, people invented weapons to defend (3) from physically superior (4) . But (5) is only one incentive for inventions. People also invent (6) tools to (7) certain established tasks more efficiently. For instance, people developed the bow and arrow from the (8) spear or javelin in order to shoot (9) and strike with greater strength.(10) civilizations developed, greater work efficiency came to be demanded, and (11) tools became more (12) . A tool would (13) a function until it proved (14) in meeting human needs, at which point an improvement would be made. One impetus for invention has always been the (15) for speed and high-quality results—provided they are achieved (16) reasonable costs. Stone pebbles were sufficient to account for small quantities of possessions, (17) they were not efficient enough for performing sophisticated mathematics. However, beads arranged systematically evolved into the abacus. The (18) of this tool can be (19) to the development of commerce in the East around 3000 B.C. and the abacus is known (20) by the ancient Babylonians, Egyptians, Chinese, etc.. 14（）
查看答案
搜索结果不匹配？点我反馈
更多问题
Which of the following is NOT the reason that the man wanted to buy a stereo
41. ______The number and variety of courses on offer these days makes it difficult to pick the right one. But thousands of Europeans who flock to Brussels Exhibition Centre will be shown how to simplify the difficult job of choosing the right course of study for the career they wish to pursue.42. ______Ten years ago a handful of Belgian teenagers, baffled by the array and number of university courses on offer, put their heads together to try to hack their way through the academic undergrowth. They knew that choosing the wrong subject or failing to make the grade would make finding a job all the more difficult. They decided something had to be done to help students approach the task of choosing a course in an effective way. They came up with the idea of a Student Fair.43. ______It was decided that this would take the form of a small forum for everyone in Belgium involved in higher education from both the French and Dutch-speaking parts of the country. It would provide the opportunity for representatives of educational institutions to give information on the courses they have on offer and allow school-leavers time to discuss these with them.44. ______But what the youngsters did not know was that they were tapping a source of anxiety among students right across Europe. The fair became an annual event. It expanded to include higher education bodies from the whole continent, becoming known as the European Student Fair.45. ______"Each year ten million students are faced with the same dilemma," said exhibition organizer Valerie de Norre. "The bewildering variety of options, the evolution of the employment market, the economic downturn, changes in working methods and personal interests all play an important role in the decision-making process. We hope the fair can help people make the correct decision for themselves."This year the theme of the fair is "the right to education for all" and to mark this there is a special exhibition area for bodies that promote equal opportunities in education. Also, the Master of Business Administration course continues to attract an enormous amount of interest across Europe and, in response to demand, fair organizers are once again holding an MBA day. 45（）
41. ______The number and variety of courses on offer these days makes it difficult to pick the right one. But thousands of Europeans who flock to Brussels Exhibition Centre will be shown how to simplify the difficult job of choosing the right course of study for the career they wish to pursue.42. ______Ten years ago a handful of Belgian teenagers, baffled by the array and number of university courses on offer, put their heads together to try to hack their way through the academic undergrowth. They knew that choosing the wrong subject or failing to make the grade would make finding a job all the more difficult. They decided something had to be done to help students approach the task of choosing a course in an effective way. They came up with the idea of a Student Fair.43. ______It was decided that this would take the form of a small forum for everyone in Belgium involved in higher education from both the French and Dutch-speaking parts of the country. It would provide the opportunity for representatives of educational institutions to give information on the courses they have on offer and allow school-leavers time to discuss these with them.44. ______But what the youngsters did not know was that they were tapping a source of anxiety among students right across Europe. The fair became an annual event. It expanded to include higher education bodies from the whole continent, becoming known as the European Student Fair.45. ______"Each year ten million students are faced with the same dilemma," said exhibition organizer Valerie de Norre. "The bewildering variety of options, the evolution of the employment market, the economic downturn, changes in working methods and personal interests all play an important role in the decision-making process. We hope the fair can help people make the correct decision for themselves."This year the theme of the fair is "the right to education for all" and to mark this there is a special exhibition area for bodies that promote equal opportunities in education. Also, the Master of Business Administration course continues to attract an enormous amount of interest across Europe and, in response to demand, fair organizers are once again holding an MBA day. 43（）
被动控制就是目标发生了偏离，分析原因，采取纠偏的措施。
微信支付 
支付宝支付