问题 选择题

如图所示的电路中,开关S闭合后,若滑动变阻器的滑片移到最下端,可能出现的现象是(  )

A.烧坏灯和电流表

B.烧坏灯和电源

C.烧坏电流表和电压表

D.烧坏电流表和电源

答案

答案:D

题目分析:根据短路现象进行分析,电源短路是电路中不允许出现的现象,否则会烧坏仪表、线路以及电源.

解答:解:当滑动变阻器的滑片移至最下端时,电源两极不经用电器形成直接连通的电路,故形成电源短路,将烧坏电流表和电源.

故选D.

点评:会识别电路的三种状态,并且知道短路现象带来的危害.

阅读理解

It is pretty much a one-way street. While it may be common for university researchers to try their luck in the commercial world, there is very little traffic in the opposite direction. Pay has always been the biggest deterrent, as people with families often feel they cannot afford the drop in salary when moving to a university job. For some industrial scientists, however, the attractions of academia (学术界) outweigh any financial considerations.

Helen Lee took a 70% cut in salary when she moved from a senior post in Abbott Laboratories to a medical department at the University of Cambridge. Her main reason for returning to academia mid-career was to take advantage of the greater freedom to choose research questions. Some areas of inquiry have few prospects of a commercial return, and Lee’s is one of them.

The impact of a salary cut is probably less severe for a scientist in the early stages of a career. Guy Grant, now a research associate at the Unilever Centre for Molecular Informatics at the University of Cambridge, spent two years working for a pharmaceutical (制药的) company before returning to university as a post-doctoral researcher. He took a 30% salary cut but felt it worthwhile for the greater intellectual opportunities.

Higher up the ladder, where a pay cut is usually more significant, the demand for scientists with a wealth of experience in industry is forcing universities to make the transition (转换) to academia more attractive, according to Lee. Industrial scientists tend to receive training that academics do not, such as how to build a multidisciplinary team, manage budgets and negotiate contracts. They are also well placed to bring something extra to the teaching side of an academic role that will help students get a job when they graduate, says Lee, perhaps experience in manufacturing practice or product development. “Only a small number of undergraduates will continue in an academic career. So someone leaving university who already has the skills needed to work in an industrial lab has far more potential in the job market than someone who has spent all their time on a narrow research project.”

小题1:By “a one-way street” (Line 1, Para. 1), the author means ________.

A.university researchers know little about the commercial world

B.there is little exchange between industry and academia

C.few industrial scientists would quit to work in a university

D.few university professors are willing to do industrial research小题2:What was Helen Lee’s major consideration when she changed her job in the middle of her career?

A.Flexible work hours.

B.Her research interests.

C.Her preference for the lifestyle on campus.

D.Prospects of academic accomplishments.小题3:Guy Grant chose to work as a researcher at Cambridge in order to ________.

A.do financially more rewarding work

B.raise his status in the academic world

C.enrich his experience in medical research

D.exploit better intellectual opportunities小题4:What contribution can industrial scientists make when they come to teach in a university?

A.Increase its graduates’ competitiveness in the job market.

B.Develop its students’ potential in research.

C.Help it to obtain financial support from industry.

D.Gear its research towards practical applications.

单项选择题