81.Television the most pervasive and persuasive of modern technologies,marked by rapid change and growth, is moving into a new era, an era ofextraordinary sophistication and versatility, which promises to reshapeour lives and our world.
82. Television is more than just anelectronics; it is a means of expression, as well as a vehicle forcommunication, and as such becomes a powerful tool for reaching otherhuman beings.
83. Even more shocking is the fact that thenumber and rate of imprisonment have more than doubled over the pasttwenty years, and recidivism——that is the rate for re-arrest——is morethan 60 percent.
84. His teaching began at the MassachusettsInstitute of Technology, but William Rainey Harper lured him to the newuniversity of Chicago, where he remained officially for exactly ageneration and where his students in advanced composition found himterrifyingly frigid in the classroom but sympathetic and understan谢谢in their personal conferences.
84.他的教书生涯始于麻省理工学院，但是William Rainey Harper把他吸引到了新成立的芝加哥大学。他在那里正式任职长达整整一代人的时间。他的高级作文课上的学生觉得他在课上古板得可怕，但私下交流却富有同情和理解。
85. The sloth pays such little attention to itspersonal hygiene that green algae grow on its coarse hair andcommunities of a parasitic moth live in the depths of its coatproducing caterpillars which graze on its mouldy hair. Its muscles aresuch that it is quits incapable of moving at a speed of over akilometer an hour even over the shortest distances and the swiftestmovement it can make is a sweep of its hooked arm.
86. Artificial flowers are used for scientificas well as for decorative purposes. They are made from a variety ofmaterials, such as way and glass, so skillfully that they can scarcelybe distinguished from natural flowers.
87. Three years of research at an abandonedcoal mine in Argonne, Illinois, have resulted in fin谢谢s thatscientists believe can help reclaim thousands of mine disposal sitesthat scar the coal-rich regions of the United States.
88. When the persua谢谢 and the planning forthe western railroads had finally been completed, the reallychallenging task remained: the dangerous, sweaty, backbreaking,brawling business of actually buil谢谢 the lines.
89. Because of the space crunch, the Art Museumhas become increasingly cautious in considering acquisitions anddonations of art, in some cases passing up opportunities to strengthenis collections.
90. The United States Constitution requiresthat President be a natural-born citizen, thirty-five years of age orolder, who has lived in the United States for a minimum of fourteenyears.
91. Arid regions in the southwestern UnitedStates have become increasingly inviting playgrounds for the growingnumber of recreation seekers who own vehicles such as motorcycles orpowered trail bikes and indulge in hill-climbing contests or in cavingnew trails in the desert.
92. Stone does decay, and so tools of long agohave remained when even the bones of the man who made them havedisappeared without trace.
93. Insects would make it impossible for us tolive in the world; they would devour all our crops and kill our flocksand herds, if it were not for the protection we get from insect-eatinganimals.
94. It is true that during their explorations theyoften faced difficulties and dangers of the most perilous nature,equipped in a manner which would make a modern climber shudder at thethought, but they did not go out of their way to court such excitement.
95. There is only one difference between an oldman and a young one: the young man has a glorious future before him andold one has a splendid future behind him: and maybe that is where therub is.
96. I find young people exciting. They have anair of freedom, and they have not a dreary commitment to mean ambitionsor love comfort. They are not anxious social climbers, and they have nodevotion to material things.
97. I am always amazed when I hear peoplesaying that sport creates goodwill between the nations, and that ifonly the common peoples of the world could meet one another at footballor cricket, they would have no inclination to meet on the battlefield.
98. It is impossible to say simply for the funand exercise: as soon as the question of prestige arises, as soon asyou feel that you and some larger unit will be disgraced if you lose,the most savage combative instincts are around.
99. It has been found that certain bats emitsqueaks and by receiving the echoes, they can locate and steer clear ofobstacles——or locate flying insects on which they feed. Thisecho-location in bats is often compared with radar, the principle ofwhich is similar.
100. As the time and cost of making a clip dropto a few days and a few hundred dollars, engineers may soon be free tolet their imaginations soar without being penalized by expensivefailure.