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Wild animals are known to listen to each other for warnings阅读理解答案.           ★★★
Wild animals are known to listen to each other for warnings阅读理解答案.
作者:佚名 文章来源:网络 点击数: 更新时间:2018/10/30 12:22:03

Wild animals are known to listen to each other for warnings that predators are near. Some birds, for example, flee when neighbors make a loud noise to announce a snake's presence.
The fairy wren is a small Australian songbird. It is not born knowing the "languages" of other birds. But recent research says it can learn the meaning of a few important sounds.
Andrew Radford is a biologist at the University of Bristol in England and co-writer of the new report published in early August in the journal Current Biology. He told the Associated Press, "We knew before that some animals can translate the meanings of other species' ‘foreign languages,' but we did not know how that ‘language learning' came about."
Birds have several ways of learning life skills. Some knowledge is genetically passed down by their parents and some comes from direct experience with the world. But Radford and other scientists are exploring a third kind of knowledge: information from fellows.
Radford and researchers at the Australian National University carried out the study in the country's National Botanic Gardens in Canberra.They attached to their bodies specially-designed, sound-producing equipment called "tweeter speakers." They wanted to see if fairy wrens would react to sounds of other birds even if they could not see them.
The scientists first played the birds two recorded sounds that they likely had never heard before. One was a warning cry of a thornbill, a bird not native to Australia. The other was a computer-generated bird sound called "buzz."
When the 16 fairy wrens in the study first heard the sounds, they had no special reaction. The scientists then tried to train half of the birds to recognize the thornbill's cry as a warning sound. They tried to train the other half to recognize the computer-generated "buzz" as a warning call.
After three days, the scientists tested what the birds had learned — and their students passed the test. The fairy wrens trained with the thornbill's cry, fled when they heard it. The group trained with the buzz, fled when they heard that sound. Neither group reacted to the sound taught to the other.
32. What does the underlined word “predators” in the first paragraph mean?
A. enemies         B. neighbors         C. birds         D. snakes
33. Which is the right order of the experiment?
    a. The fairy wrens were divided into two parts.
b. The fairy wrens made no reaction to the strange sounds.
c. The fairy wrens wore sound-providing equipment.
d. The fairy wrens were trained separately.
e. The fairy wrens passed the test successfully.
A. a b c d e           B. c b a d e         C. c e b a d        D. a c e d b
34. It can be learned from the study that the fairy wrens _______.
A. were not good “foreign language” learners     
B. made no reaction to the sounds all the time          
C. took both of the sounds as warnings           
D. fled when hearing the sound trained with
35. The passage is probably taken from________.
A. A biology textbook                        B. A science magazine  
C. A science fiction                          D. A wildlife brochure
ABDB


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