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
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