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Bats are able to guide them by producing sound waves too high for us to hear.
A B C D
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Bats (are able) to (guide them) by producing sound waves (too high) for us (to hear).
A．are able
B．guide them
C．too high
D．to hear
A．Those moths that cannot hear the sounds emitted by insect-eating bats live longer on the average than those that can hear such sounds when both kinds of moth are in an environment continuously free of such bats.
B．Those moth species that cannot hear the sounds emitted by insect-eating bats are among the species of insects that are most likely to be caught by such bats.
C．When a moth changes its speed or direction of flight, there is a change in the sound pattern generated by the moth"s wing movements.
D．Moth species that can hear the sounds emitted by insect-eating bats are less likely to be caught by such bats than are moth species that cannot hear these sounds.
E．Moths that are capable of hearing the sounds emitted by insect-eating bats differ in their abilities to use evasive action to escape capture by such bats.
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
听力原文： All warm-blooded animals are very helpless at first. Young birds and young bats must be taught to fly. Thousands of young seals drown every year. They never learn to swim "naturally." The mother has to take them out under her flipper and show them how. Birds sing without instruction; however, they do not sing well unless they are able to hear older members of their species. Older harvest mice build better nests than beginners. Frank Buck says that the young elephant does not seem to know at first what his trunk is for. It gets in his way and seems more of a hindrance than a help until his parents show him what to do with it. Insects, seem to start life equipped with all necessary reflexes, but they seem to improve their talents with practice. Young spiders, for example, begin by making quite primitive little webs. They attain perfection in their art only after much time. Older spiders, if deprived of their spinnerets, will take to hunting.
(33)
A．They know what to do because of instinct.
B．They know how to fly naturally.
C．They often reject their parents.
D．They learn behavior. from their parents or other animals.
Some researchers recently have studied the eyes of the common frogs and have discovered that a frog's eyes only find moving things such as insect-shaped objects and large, threatening objects. As a result of studying the eyes of frogs, scientists have constructed a simple electronic model of a frog's eyes which can track airplanes circling above an airport and then provide information to computer-run air traffic control systems. Someday such electronic eyes may provide the means to automatically guide automobiles by providing information about objects moving toward the automobile. Other scientists have studied the compound eyes of some insects and crabs and have built a seeing machine that is a simple model of the horseshoe crab eye.
The hearing of a number of creatures also has been studied extensively so that hearing machines can be developed. Bats have unusual hearing which can extend into the ultrasonic (超声的) range. The dolphin also has been studied extensively, and dolphins are able to navigate through water extremely effectively. Radar and sonar(声 纳) systems which are used to help ships and planes navigate have been based on the sonar systems of both bats and dolphins.
Which of the following could be the best title？
A．Electronic Eyes
B．The Science of Bionics
C．Sonar Systems
D．The Hearing of Some Creatures
听力原文： Welcome to Emmerson National Park. I'm Dean and this is Dan and we'll be your guides today on what is sure to be a wonderful experience. We are delighted to be assisting you in experiencing the flora that is unique to Emmerson National Park. Following the tour of the park, we'll be having lunch at the Atrium located in the visitors' center. The spring season has fully arrived so you will be able to see that everything is in full bloom. Some of our species of plants do not exist in any other country in the world, so have your cameras ready, but please do not touch any of the plants. It's also important to remember that littering of any sort is strictly prohibited. Please put all of your trash into the garbage canisters provided in the park.
Who is the speaker？
A．A security guard
B．A tour guide
C．The park ranger
D．A park guest
III. Each sentence below has four underlined parts. Pick out the incorrect part and then correct it. (20%)（共20分，每题2分） 1. Unlike many other people, the America Indians had to discover A B C Agriculture for themselves.() D 2. When a spider catches an insect, it releases some poison into an A B insect with its fangs, the poison of most spiders is harmless to man. C D () 3. We see lighting before we hear the thunder because sound travels A B more slowly than light is. () C D 4. Winston Churchill, as the British Prime Minister, leads his country A B to victory during the Second Word War. () C D 5. Bats are able to guide them by producing sound waves too high for A B C us to hear. () D 6. No sooner had the hikers set out on their trip as it began to rain. A B C D () 7. Doctor Godwin says that no matter how forceful arguments against A B smoking there are, many people persist in smoking.() C D 8. Since two or three hours, those technicians have been working on A B C D the computer. () 9. The fire began in the fifth floor of the hotel, but it soon spread to A B C D the other floors. () 10. Neither in his campaign nor his acceptance speech did Mr. Miles A B C acknowledge those whose assistance had won him the nomination. D ()
The scary things and symbols of Halloween include ___________.
A.ghosts
B.bats
C.spiders
D.Jack-O-Lanterns
A．disfigured
B．punctual
C．depraved
D．harmless
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