[单项选择]Scientific research has revealed that throughout the animal world, communication is just as important as it is to human beings. Countless animals lack the (67) for human speech, yet they employ entirely different methods in order to communicate (68) each other. Some of the most dramatic examples of this are provided by birds. There arc roughly 10000 (69) of birds in the world, each of which has its own miraculous features. (70) you may live, you can see a great number of these feathered creatures and can (71) different and extraordinary properties. In addition to their flawless flight mechanisms, expertise (72) the routes and timing of migrations, and ability to build nests, their methods to communicate is (73) wonder. At critical times in birds’ lives, their (74) of hearing becomes particularly important. Experiments have shown that in order for birds to learn the (75) song of their own species, they nee
A. Wherever
B. If
C. As
D. When

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[单项选择]Scientific research has revealed that throughout the animal world, communication is just as important as it is to human beings. Countless animals lack the (67) for human speech, yet they employ entirely different methods in order to communicate (68) each other. Some of the most dramatic examples of this are provided by birds. There arc roughly 10000 (69) of birds in the world, each of which has its own miraculous features. (70) you may live, you can see a great number of these feathered creatures and can (71) different and extraordinary properties. In addition to their flawless flight mechanisms, expertise (72) the routes and timing of migrations, and ability to build nests, their methods to communicate is (73) wonder. At critical times in birds’ lives, their (74) of hearing becomes particularly important. Experiments have shown that in order for birds to learn the (75) song of their own species, they nee
A. simplicity
B. curiosity
C. capacity
D. ability

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