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1、【例1】So long as teachers fail to distinguish between teaching and learning, they will continue to undertake to do for chilldren that which onloy children can do for themselves. Teaching children to read is not passing reading on to them. It is certainly not endless hours spent in activities about rea
2、ding. Douglas insists that “reading cannot be taught directly and schools should stop trying to do the impossible.”Teaching and learning are two entirely different processes. They differ in kind and function. The function of teaching is to create the conditions and the climate that will make it poss
3、ible for children to devise the most efficient system for teaching themselves to read. Teaching is also a public acitivity: it can be seen and observed.Learning to read involves all that each individual does to make sense of the world of printed language. Almost all of it is private, for learning is
4、 an occupation of the mind, and that process is not ope to public scrutiny.If teacher and learner roles are not interchangeable, what then can be done through teaching that will aid the child in the quest for knowledge? Smith has one principal rule for all teaching instructions. “Make learning to re
5、ad easy, which means making reading a meaningful, enjoyable and frequent experience for children.”When the roles of teacher and learner are seen for what they are, and when both teachers and learners fulfill them appropiately, then much of the pressure and feelingof failure for both is eliminated. L
6、earning to read is made easier when teachers create an environment where children are given the opportunity to solve the problem of learning to read by reading.It is hard to track the blue whalel, the oceans largest creature, which has almost been killed off by commercial whaling and is now listed a
7、s an endangered species. Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behaviour.So biologists were delighted early this year when, with the help of the Navy, they were able to track a particular blue whale for 43 days, monitoring i
8、ts sounds. This was possible because of the Navys formerly topo-secret system of underwater listening devices spanning the oceans.Tracking whales is but one example of an exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partely uncover its glo
9、bal network of underwater listening system builtll over the decades to track the ships of potential enemies.Earth scientists announced at a news conference recently that they had used the system for closely monitoring a deep-sea volcanic eruption for the first time and that they plan similar studies
10、.Other scientists have proposed to use the network for tracking ocean currents and measuring changesin ocean and global temperatures.The speed of sound in water is roughly one mile a second-slower than through land but faster than through air. What is most important, different layers of ocean water
11、can act as channels for sounds, focusing them in the same way a stethoscope(听诊器) does when it carries faint noises from a patients chest to a doctors ear. This focusing is the main reaso that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles
12、.Americans are proud of their variety and individuality, yet they love and respect few things more than a uniform, whether it is the uniform of an elevator operator or the uniform of a five-star general. Why are uniform so popular in the United States?Among the arguments for uniforms, one of the fir
13、st is that in the eyes of most people they look more professional than civilian clothes. People have become conditioned to expect superior quality from a man who wears a uniform. The television repariman who wears a uniform tends to inspire more trust than one who appears in civilian clothes, Faith
14、in the skill of a garage mechanic is increased by a uniform. What easier way is there for a nurse, a policeman, a barber, a waiter to lose professional identity than to step out of uniform?Uniforms also have many practicall benefits. They save on other clothes. They save on laundry bills. They are t
15、ax-deductible. They are often more comfortable and more durable than civilian clothes.Primary among the arguments against uniforms is their lack of variety and the consequence loss of individuality experienced by people who must wear them. Though there are many types of uniforms, the wearer of na pa
16、rticular type is generally stuck with it, without change, unitl retirement. When people look alike, they tend to think, speak, and act similarly, on the job at least.Uniforms also give rise to some practical problems. Though they are longo-lasting, often their initial expense is greater tha the cost of civilian clothes. Some uniforms are also expensive to maintain, requiring professional dry cleaning rather than the home laundering possible with many types
