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21. The word bested most probably means ________. A) beatB) envied C) caught up with D) made the best of 注：词汇题，根据第5段末句的意思可推断为A选项。 22Which of the following statements is true? A) Active smokers in general performed better than deprived smokers. B) Active smokers responded more quickly than the other subjects. C) Non-smokers were not better than other subjects in performing simple tasks. D) Deprived smokers gave the slowest responses to the various tasks. 注：C选项是第一个实验结果deprived smokers and non-smokers performed equally well Questions 16 to 20 are based on the following passage: 16. According to the author, the sonar system of bats is an example of the idea that ____. A) this is the age of technological triumphs B) modern machines are inefficient C) living mechanisms are often more efficient than man -made machines D) artificial imitations are always less efficient than living mechanisms 17. The author suggests that the sonar system of bats ____. A) was at the height of its perfection 50 million years ago B) is better than man-made sonar because it has had 50 million years to be be refined C) should have been discovered by man many years ago D) is the same as it was 50 million years ago 18. Echo location in this article means the _____. A) location of echoes B) ability to determine where an echo comes from C) scientific term for sound waves D) ability to locate unseen objects by echoes 19 This article was written to illustrate ____. A) the deficiencies of man-made sonar B) the dependence of man upon animals C) that we are living in a machine age 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 | 
