题目内容
（请给出正确答案）
A.blending
B.abbreviation
C.compounding
D.affixation
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更多“The word "sonar（声纳)" is formed by means of_________.”相关的问题
A、acing conflicts of interest and protecting the client’s negotiating position at all times
B、facing conflicts of interest and hurting the client’s negotiating position at all times
C、avoiding conflicts of interest and protecting the client’s negotiating position at all times
D、avoiding conflicts of interest and hurting the client’s negotiating position at all times
century 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 way back to the bell tower，and on examining heir stomachs‘ contents，Spallanzani found that
they had been able to capture and gorge themselves with flying insects.We know from experiments that bats easily find insects in the dark of night ， even when the insects emit no sound that can be heard by human ears.A bat will catch hundreds of soft-bodied，silent-flying moths or gnats in a single hour.It will even detect and chase pebbles or cotton spitballs tossed into the air.
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 refined
C.would have been discovered by man many years ago
D.is the same as it was 50 million years ago
18.The fact that“blind bats”will detect and chase cotton spitballs as well as insects is remarkable because.()
A.bats do not eat spitballs
B.cotton is harder to track
C.Spitballs make no sounds audible to human ears
D.there is purpose in the flight of insects
19.This passage 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.Which of the following is the main point of the passage?()
A.A bat will catch hundreds of gnats in a single hour
B.Here is a perfection in nature which sometimes cannot be matched by man‘s creative efforts
C.The phrase“blind as bat”is valid
D.director of NIH learned of the abuse
A、they will ask any questions
B、they will not raise their questions
C、they will ask the presenter to explain again
D、they will leave in the middle of the presentation
A、Scientific and technical information and written materials
B、Descriptions of structure and rules of operation in operative manuals
C、Synopsis of Minutes
D、The language of talks, meetings and conversations on scientific or technical problems
A、abbreviation
B、affixation
C、compounding
D、blending
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