It is a task which can be attempted in various of ways, some of which are 1._____ 　　more appropriate than others. When the material to be learned is 2._____ 　　a brief and simple kind which is familiar with the person and of intense 3._____ 　　interest to him, effective learning usually proceeds automatically. 　　In the first place, the person at once relates the material to other 　　material which has already securely learned. Subsequently, the relevance 4._____ 　　of the newly learned material to his interests assures its being 5.______ 　　recalled on many occasions; and one repetition minimizes 6.______ 　　the likelihood of remembering. Furthermore, the subsequent use 7.______ 　　of the new material is likely to take place in a variety of contexts 　　and, so, the material becomes related to a narrower range of other material. 8.___ 　　Because of all this, the material is rapidly learned, long retained, 　　and recalled with increasingly readiness in a variety of 9._____ 　　contexts. Without really trying, the person had fulfilled a 10._____ 　　few important conditions of effective learning. 　　1.第一个 of 去掉 　　2. is 后加 of 　　3. with 改为to 　　4. has改为 is 或者在has后加been 　　5. assures 改为 ensures 　　6. one 改为this / the 　　7. remembering改为 forgetting 　　8. narrower 改为 wider 　　9. increasingly改为 increasing 10. had 改为 has     When initially introducing into the market, the process 1._____ 　　of adoption is slow. The early models are expensive and 　　hard to use, and perhaps even unsafe. The economic 　　impact is relatively great. 2. _____ 　　The second phase is the explosive one, where the innovation 　　was rapidly adopted by a large number of people. It gets 3. _____ 　　cheaper and easier to use and becomes something familiar. 　　And then in the third stage, diffusion of the innovation 　　slows down again, as if it permeates out across the economy. 4. _____ 　　During the explosive phase, whole new industries spring 　　up to produce the new product or innovation, and to service 　　it. For example, during the 1920s, there was dramatic 5. _____ 　　acceleration in auto production, from 1.9 million in 1920 　　to 4.5 million in 1929. This boom was accompanied with all 6. _____ 　　sorts of other essential activities necessary for an 　　auto-based nation: Roads had to been built for the cars to 7. _____ 　　run on; refineries and oil wells, to provide the gasoline; 　　and garages, to repair it. 8. _____ 　　Historically, the same pattern is repeated again and again 　　with innovations. The construction of the electrical system 　　requested an enormous early investment in generation and 9. _____ 　　distribution capacity. The introduction of the radio was 　　followed by a buying spree (无节制的狂热行为) by Americans 　　what quickly brought radios into almost half of all households 10. _____ 　　by 1930, up from nearly none in 1924. 　　1. introducing改 introduced; 　　2. great 改 small; 　　3. was 改 is; 　　4. as 后面的 if 去掉；　　5. was 后面加a; 　　6. with 改 by; 　　7. been 改 be; 　　8. it 改 them; 　　9. requested 改 required; 　　10. what 改 that.      

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