题目内容
The blackboard and chalk______(正在被电脑和投 影机所取代)．
查看答案
搜索结果不匹配？点我反馈
更多问题
There is nothing illogical or synthetic about the humility of great bookmen in calling attention to the lirnitations of the book．No book can (62) us to knOW everything that is to be known, or feel everything that is to be felt．A book is part of life, not a substitute (63) it．It is not a fit (64) for worship or enshrinement．It loses its charm and much of its value when accepted (65) ．No one would have been more (66) than Aristotle if he could have known of the excessive and (67) veneration(尊敬, 崇拜)that would be given to his ideas in centuries to (68) ． When his works became the (69) words of advance knowledge, (70) knowledge became neither advanced nor vital． The particular occasion for these remarks is that there are (71) here and there that some of US in the book would may be (72) ourselves too seriously．In the effort to increase book reading some (73) things are being said about books．It is made to (74) ,that nothing is happening now that has not happened before, and that the only tree approach to understanding is (75) books．We do neither service nor justice to books by (76) upon them such omnipotence(全能)and omniscience (全知)．Many of the answers we need today are necessarily to be found between (77) ．There are elements of newness in the present (78) of man that will not readily be (79) of by required reading or ready reference． Books are not slide rules or blueprints for (80) automatic answers．What is needed is a mighty blend of the wisdom of the ages (81) flesh, razor-edge analytical thought．
Passage Three Death comes quickly in the mountains. Each winter holiday makers are caught unawares as they happily ski away from the fixed runs, little realizing that a small avalanche can send them crashing in a bone-breaking fall down the slope and leave them buried under tons of crisp white snow. There are lots of theories about how to avoid disaster when hit by an avalanche. Practice is normally less cheerful. The snow in the Salzburg of Austria where a recent disaster took place was typical avalanche material: For several days before the incident I had skied locally. Early winter snow was wearing thin and covered with ice. On top of that new, warmer flakes were gently falling to produce a dangerous carpet. To the skier who enjoys unmarked slopes it is tempting stuff, deep new power snow on a hard base--the skiing that dreams are made of And sometimes nightmares. Snow falls in sections like a cake. Different sections have different densities because of the temperatures at the time of the fall and in the weeks afterwards. Problems come when any particular section is too thick and not sticking to the section beneath. The snow of the past few weeks had been falling in rather higher temperatures than those of December and early January. The result of these conditions is that even a slight increase in the temperatures sends a thin stream of water between the new snow and the old. Then the new snow simply slides off the mountain. Such slides are not unexpected. Local citizens know the slopes which tend to avalanche and the weather in which such slides are likely. Traps are set to catch the snow or prevent it slipping; bombs are placed and exploded from time to time to set off small avalanches before a big one has time to build up; and above all, skiers are warned not to ski in danger areas. In spite of this, avalanches happen in unexpected areas and, of course, skiers ignore the warnings. The one comfort to recreational skiers, however, is that avalanche incidents on the marked ski slopes are quite rare. No ski resort wants the image of being a death trap. Each winter holiday makers in the mountains come face to face with death because ______.
Passage Three Death comes quickly in the mountains. Each winter holiday makers are caught unawares as they happily ski away from the fixed runs, little realizing that a small avalanche can send them crashing in a bone-breaking fall down the slope and leave them buried under tons of crisp white snow. There are lots of theories about how to avoid disaster when hit by an avalanche. Practice is normally less cheerful. The snow in the Salzburg of Austria where a recent disaster took place was typical avalanche material: For several days before the incident I had skied locally. Early winter snow was wearing thin and covered with ice. On top of that new, warmer flakes were gently falling to produce a dangerous carpet. To the skier who enjoys unmarked slopes it is tempting stuff, deep new power snow on a hard base--the skiing that dreams are made of And sometimes nightmares. Snow falls in sections like a cake. Different sections have different densities because of the temperatures at the time of the fall and in the weeks afterwards. Problems come when any particular section is too thick and not sticking to the section beneath. The snow of the past few weeks had been falling in rather higher temperatures than those of December and early January. The result of these conditions is that even a slight increase in the temperatures sends a thin stream of water between the new snow and the old. Then the new snow simply slides off the mountain. Such slides are not unexpected. Local citizens know the slopes which tend to avalanche and the weather in which such slides are likely. Traps are set to catch the snow or prevent it slipping; bombs are placed and exploded from time to time to set off small avalanches before a big one has time to build up; and above all, skiers are warned not to ski in danger areas. In spite of this, avalanches happen in unexpected areas and, of course, skiers ignore the warnings. The one comfort to recreational skiers, however, is that avalanche incidents on the marked ski slopes are quite rare. No ski resort wants the image of being a death trap. In areas where avalanches are known to happen ______.
光照强度在赤道地区最大，随纬度增加而减弱。( )
微信支付 
支付宝支付