英语四级写作背诵范文(四).docx

电襄洛曼国医英语 IROCKY MTtRMATMmM EMCLMM Electricity The modern age is an age of electricity. People are so used to electric lights, radio, televisions, and telephones that it is hard to imagine what life would be like without them. When there is a power failure, people grope about in flickering candlelight, cars hesitate in the streets because there are no traffic lights to guide them, and food spoils in silent refrigerators. Yet, people began to understand how electricity works only a little more than two centuries ago. Nature has apparently been experimenting in this field for million of years. Scientists are discovering more and more that the living world may hold many interesting secrets of electricity that could benefit humanity. All living cell send out tiny pulses of electricity. As the heart beats, it sends out pulses of record; they an electrocardiogram, which a doctor can study to determine how well the heart is working. The brain, too, sends out brain waves of electricity, which can be recorded in an electroencephalogram. The electric currents generated by most living cells are extremely small - often so small that sensitive instruments are needed to record them. But in some animals, certain muscle cells have become so specialized as electrical generators that they do not work as muscle cells at all. When large numbers of these cell are linked together, the effects can be astonishing. The electric eel is an amazing storage battery. It can seed a jolt of as much as eight hundred volts of electricity through the water in which it live. An electric house current is only one hundred twenty volts. As many as four-fifths of all the cells in the electric eel s body are specialized for generating electricity, and the strength of the shock it can deliver corresponds roughly to length of its body. 培训学校 Direction For this part, you are allowed 30 minutes to write a short essay on the topic Private School You should write at least 150 words following the outline given below in Chinese 1 .当前，社会上有很多私立学校和培训学校； 2 ,私立学校的利与弊 3 .你的看法 范文 It can be noticed that a large number of private schools or training organizations become a new landscape in education. When you read newspapers, when you watch TV, when you walk on the road, you will inevitably see lots of advertisements about private schools. There are private schools mainly dealing with foreign languages, computers, music and sports. However, is it a good or bad thing to have so many private schools As a coin has two sides, so are the private schools. On the one hand, private schools can meet the special needs of the society or the particular requirements of people. On the other hand, they often bring people extra burden because of comparison and competition. When asked to decide whether we should have a society without private schools or a society with private schools, I will not hesitate a moment to prefer the latter. Although attending a training course will result in the ext