D) that the sonar system of bats is remarkable
20. The following is the main point of the article:____
A) A bat will catch hundreds of insects in a single hour.
B) There is a perfection in nature which sometimes can not be matched by mans creative efforts.
C) The phrase blind as a bat is valid.
D) Sonar and radar systems of man are inefficient.
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 system of bats. It is billions of times more efficient and more sensitive than the radars and sonars designed by man.
注:1.triumph 胜利,成功 2.it is well to 有必要
3.incomparably 不可比地 4.第一句主题句:天然胜于人工 artificial 人工的5.illustration 例证,本段末句强烈结论
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
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