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  3. Scientific research has revealed that throughout the animal world, communica

Scientific research has revealed that throughout the animal world, communica

游客2023-07-25  43
问题     Scientific research has revealed that throughout the animal world, communication is just as important as it is to human beings. Countless animals lack the【C1】______for human speech, yet they employ  entirely different methods in order to communicate【C2】______each other. Some of the most dramatic examples of this are provided by birds. There are roughly 10 000【C3】______of birds in the world, each of which has its own miraculous features.【C4】______you may live, you can see a great number of these feathered creatures and can【C5】______different and extraordinary properties. In addition to their flawless flight mechanisms, expertise【C6】______the routes and timing of migrations, and ability to build nests, their methods to communicate  is【C7】______wonder. At critical times in birds’ lives, their【C8】______of hearing becomes particularly important. Experiments have shown that in order for birds to learn the【C9】______song of their own species,  they need an auditory feedback system.【C10】______this system, young birds learn to【C11】______the sounds they produce with the song they have memorized. If they were【C12】______, it wouldn’t normally be【C13】______for them to recognize songs. Birds’ extremely sensitive hearing functions perfectly. Clearly, if this sense failed to【C14】______properly, the bird would not be able to hear any sounds【C15】______Moreover, birds also produce【C16】______communications by their facial expressions, beak movements, feather ruffling, and【C17】______their wings. Although each species has its own body language, many different species【C18】______movements in the same way. Via facial expression, birds can【C19】______a variety of messages to those around them--negative feelings such as dislike and resentment, as well as【C20】______ones like pleasure, enthusiasm  and curiosity. [br] 【C20】
选项 A、objective
B、active
C、affirmative
D、positive
答案 D
解析 形容词辨义题。这里从两方面举例说明鸟类通过面部表情所传达的信息，前面一类提到的是负面的感觉，如厌恶、愤恨，后面一类提到的是诸如热情、好奇这类的感觉，这些应该是正面的、积极的感觉，所以应该选positive。objective“客观的”；active“积极主动的”；affirmative“肯定的，确实的”。
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