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ters are not capable of this spiritual encouragement. A teacher will notice that a student is not interested in a certain subject and does not listen carefully in class. The teacher will talk with this student after class and find out the reasons why this student is not interested. Then the teacher can tell the student the importance of this subject and motivate the student to learn harder. 2. Teachers have different approaches to teaching different students and will adjust the content or style of teaching according to the needs of different students. However computers only have fixed programs. A teacher can even design a tailor-made study plan for a particular student according to his or her needs. But computers view every student as the same individual. 3. Apart from academic teaching, teachers are also concerned about the psychological growth of students and often teach students about moral integrity. In contrast, computers are just machines and do not have feelings or emotions. Teachers will teach students about such virtues as love, honesty, moral integrity and friendship etc. 4. Computers are machines after all and machines break down sometimes. If students depend too much on computers for studying, they will feel at a loss when these machines go wrong and don not work properly 5. Learning and teaching is a highly interactive process. Different students will have different questions during different stages of teaching and learning. And the teachers will have to answer them accordingly and in different ways. But computer programs are pre-designed by programmers without knowing all the varying circumstances during real teaching and learning and therefore cannot give satisfactory answers to all these questions. Teachers can use computers as a very good aide in the classroom for presenting multimedia files. Teachers and computers can co-exist in the classroom peacefully. Teachers and computers can be a perfect match in the classroom. For example, in a listening lab equipped with computers, students will be able to record the listening materials in a CD-Rom and then take home to listen more. 雅思范文：城市扩大 Since cities have changed a lot, the size of the cities has grown enormously. Discuss the causes and consequence of the enormous size of cities. Nowadays, the maps of cities are updated frequently. With the development of city, more and more suburbs become parts of the city. When the cities in the world are amplifying constantly, people discuss the topic hotly, the causes and consequence of the enormous cities. Different people have different answers by their respective views. In my opinion, the evolution of society and the development of economy result in the growth of the vast size of cities. Since the number of population in every city is increasing continually, people need a large amount of space to live in. With the progress of the technology, the output of crops rises sharply. Fewer and fewer farmers are required, as a result, more and more villages urbanize. The growth of the cities brings us many huge changes. There are more job opportunities in the cities. For instance, China will hold the Olympic Games in Beijing in 2008. The government is amplifying the size of Beijing to build new gyms in order to hold it excellently. Obviously, people in the cities could gain a lot of new jobs. Of course, the enormous size of cities also has bad effects. Pollution is becoming more and m