also save space.A few fibers can carry more calls than thousands of strands of copper cable.
Optical fibers will be used for video as well as voice communications.And they will prove useful in computer-to-computer hookups.However,it will take years to replace existing wires.
1.Which of the following best expresses the main point of the passage? a.Fiber optics are flexible,glass fibers.
b.Copper wires have been used in most phone systems. c.Fiber optics are an improvement in communication systems. d.A few optical fibers can carry thousands of phone calls.
2.As it is used in the passage,the phrase\_____.
a.transmission of information by means of infra-red light signals aling a thin glass fiber.
b.material or substance formed from a mass of fibers.
c.a flexible fiber-optic instrument that is used to view objects d.a composite material consisting of glass fibers in resin
3.Which of the following can not be inferred about fiber cables from the passage?
a.They carry light waves.
b.They can be used in many forms of communication. c.They are better than copper wires. d.They are shorter than copper wires.
4.You can infer from the passage that a \ a.a group of wires or strands that are bundled together b.a copper wire that is used to carry phone calls c.a glass fiber that carrise coded bursts of light d.a laser that changers electrical impulses into light
5.You can infer from the passage that the word\nearly means _____.
a.carry from one place to another b.pulse with light c.operate quickly d.speak
第31篇答案：cadaa
第32篇
In October 1987,the National Board for Professional Teaching Standards began its word to set new standards of accomplichment for the teaching profession and to improve the quality of education available to all children in the United States.
Teachers are committed to students and their learning.They must act on the belief that all students can learn.They must recognize individual differences in their students and adjust their practice accordingly.They must know that their mission extends beyond developing the cognitive capcity of their students.They must be concerned with their students' self-concept,with their motivation,and with the development of character.
Teacher must know the subjects they teach and how to teach them.They must command sepecialized knowledge of how to convey a subject to sudents.Teachers are responsible for managing and monitoring student learning.They must call on multiple methods to meet their goals,knowing and being able to employ a variety of instructional skills.Teachers must think systematically about their practice and learn from experience,seeking the advice of others and drawing on education research and scholarship to improve their practice.
As members of learning communities,teachers contribute to school effectiveness by collaborating with other professionals.They take advantage of community resources,cultivation knowledge of their school's community as a powerful resource for learning.
1.\are committed to students and their learning.\sentence means that _____.
a.teachers should meet all the demands of students b.teachers should set verry high demands on students c.teachers should be very kind to students
d.teachers must be responsible for students and their leaning
2.According to the author,if a student performs poorly at school,it may be the duty of _____. a.society b.teachers
c.parents d.other students
3.Teachers' task should go beyond developing the learning ability of students and they should _____. a.know he subjects they teach b.transmit valued knowledge
c.respect their students,know about their interests and develop their character
d.seek the advice of others
4.School effectiveness mainly depends on _____. a.teachers who work together b.Students
c.teaching materials d.school leaders
5.The best title for this passage is _____. a.How to Manage Student Learning b.Learning from Experience
c.Relations Between Teachers and Students d.Toward High Standards for Teachers
第32篇答案：dadca
In the early days of nuclear power,the united states made money on it. But today opponents have so complicated its development that no nuclear plants have been ordered or built here in 12 years.
The greatest fear of nuclear power opponents has always been a reactor \health are very little.But to even further reduce the possibility,engineers are testing new reactors that rely not on human judgment to shut them down but on the laws of nature.Now General Electric is already building two advanced reactors in Japan.But don't expect them even on U.S.shores unless things change in Washington.
The procedure for licensing nuclear power plants is a bad dream.Any time during,or even after,construction,an objection by any group or individual can bring everything to a halt while the matter is investigated or taken to
court.Meanwhile,the builder must add nice-but-necesary improvements,some of which force him to knock down walls and start over.In every case when a plant has been opposed,the Nuclear Regulation Commission has ultimately granted a license to construct ends up abandoning the plant anyway.
A case in point is the Shoreham plant on New York's Long Island.Shoreham was a virtual twin to the Millstone plant in Connecticet,both ordered in the mid-60s'.Millstone,complete for ＄101 million,has been generating electricity for two decades.Shoreham, however,was singled out by antinulear activists who,by sending in endless protests,drove the cost ＄5 billion and delayed its use for many years.
Shoreham finally won its operation license.But the plant has never produced a watt power.Governor Mario Cuomo,an opponent of a Shoreham start-up, used his power to force New York's publicutilities commission to accept the following settlement: the power company could pass the cost of Shoreham along to its consumers only if it agreed not to operate the plant.Today,a perfectly good facility,capable of servicing hundreds of thousands of homes,sits rusting.
1.The author's attitude towards the development of nuclear power it _____. a.negative b.neutral c.positive d.questioning
2.What has made the procedure for licensing nuclear power plants a bad dream? a.The inefficiency of the nuclear regulation commission b.The enormous cost of comstruction and operation c.The length of time it takes to make investigation. d.The objection of the opponents of nuclear power.
3.It can be inferred from paragraph 2 that ______.
a.there are not enough safety measures in the u.s for running new nuclear power plants.
b.it is not technical difficulties that prevent the building of nuclear power plants in the u.s.
c.there are already more nuclear power plants than necessary in the U.S. d.the American government will not allow Japanese nuclear reactors to be installed in the u.s.
4.Governor Mario Cuomo's chief intention in porposing the settlement was to _______.
a.stop the Shoreham plant from going into operation
b.urge the Shoreham company to further increase its power supply c.permit the Shoreham plant to operation under certain conditions d.help the power company to solve its financial porblems
第33题答案:cdba
第34篇
Very old people do raise moral problems for almost everyone who comes in contact with them. Their values-this can't be repeated too often-are not necessarily our values. Physical comfort, cleanness and order not necessarily the most important things. The social services from time to time find themselves faced with a flat with decaying food covered by small worms, and an old person lying alone in bed, taking no notice of the worms. But is it interfering with personal freedom to insist that they go to live with some of their relatives so that they might be taken better care of? Some social workers, the ones who clear up the worms, think we are in danger of carrying this concept of personal freedom to the point where serious risks are being taken with the health and safety of the old.
Indeed, the old can be easily hurt or harmed. The body is like a car, it needs more mechanical maintenance as it gets older. You can carry this comparison right through to the provision of spare parts. But never forget that such operations are painful experiences, howerer good the results. And at what point should you cease to treat the old body? Is it morally right to try to push off death by pursuing the development of drugs to excite the forgetful old mind and to activate the old body, knowing that it is designed to die? You cannot ask doctors or scientists to decide, because so long as they can see the technical opportunities, they will feel bound to give them a try, on the principle that while there's life, there's hope.
When you talk to the old people, however, you are forced to the conclusion that whether age is happy or unpleasant depends less on money or on health than it does on your ability to have fun.
1.It is implied in Paragraph 1 that __________ . a.very old people enjoy living with their relatives