2022英语四级考试阅读学习笔记(7)Questions 16 to 20 are based on the following passage:In these days of technological triumphs, it is well to remind ourselves from time to time that living mechanisms are often incomparably more efficient than their artificial imitations. There is no better illustration of this idea than the sonar (声纳) system of bats. It is billions of times more efficient and more sensitive than the radars and sonars designed by man.注：1.triumph 成功，胜利2.it is well to 有必要3.incomparably 不行比地4.第一句主题句：自然胜于人工 artificial 人工的5.illustration 例证，本段末句剧烈结论Of course, the bats have had some 50 million years of evolution to refine their sonar. Their physiological mechanisms for echo location, based on all this accumulated experience, therefore deserve our thorough study and analysis.注：1.refine 提炼、改善2.二段首句是对首段末句的解释3.50 million years对应的是第17小题17. The author suggests that the sonar system of bats _A) was at the height of its perfection 50 million years agoB) is better than man-made sonar because it has had 50 million years to be be refinedC) should have been discovered by man many years agoD) is the same as it was 50 million years ago注：B 选项表达一段结尾和二段开头，应当优选，含有关系词 because,although,not only.but also, as well as 的应当优选To appreciate the precision of the bats” echo location, we must first consider the degree of their reliance upon it. Thanks to sonar, an insect-eating bat can get along perfectly well without eyesight. This was brilliantly demonstrated by the Italian naturalist Lazzaro Spallanzani. He caught some bats in a bell tower, blinded them and released them outdoors. Four of these blind bats were recaptured after they had found their ways back to the bell tower, and on examining their stomachs” contents, Spallanxani found that they had been able to capture and eat flying insects. We know from experiments that bats easily find insects in the dark of night, even when the insects make no sound that can be heard by human ears. A bat will catch hundreds of softbodied silent flying insects in a single hour. It will even detect and chase pebbles (卵石) tossed (向上扔）into the air.注：1.其次句Thanks to sonar. 结果句2.get along 生活 get along with 相处3.blind 蒙住眼睛4.We know from. 结果句5.末句为细节16. According to the author, the sonar system of bats is an example of the idea that _.A) this is the age of technological triumphsB) modern machines are inefficientC) living mechanisms are often more efficient than man -made machinesD) artificial imitations are always less efficient than living mechanisms注：1.第一段 illustration 等同 example2.D选项的always与文章中的often含义是不同的。In these days of technological triumphs, it is well to remind ourselves from time to time that living mechanisms are often incomparably more efficient than their artificial imitations. There is no better illustration of this idea than the sonar (声纳) system of bats. It is billions of times more efficient and more sensitive than the radars and sonars designed by man.17. The author suggests that the sonar system of bats _A) was at the height of its perfection 50 million years agoB) is better than man-made sonar because it has had 50 million years to be be refinedC) should have been discovered by man many years agoD) is the same as it was 50 million years ago