【正确答案】 B

【答案解析】[听力原文] A baby spends the first year of life learning to listen. A newborn child comes equipped with a finely tuned pair of ears, but he doesn't yet know how to use them. A buzz of meaningless noise surrounds him. No one sound means more than any other. Unlike his ears, the hearing center of his brains is still immature. As the baby grows, two things happen. First, he becomes better at picking out certain sounds. Second, he begins to remember them. This development is easy to see. If you make a loud sound near a day old baby's head, you will not see any reaction. Only a check on his pulse or breathing rate will show a change. But just two weeks later, the same noise will make him jerk. He may even turn his head toward you, now the human voice means something to him. If he hears another baby crying, he may cry. By his fourth to sixth week, sounds like the doorbell or the closing of a door no longer surprise him. What is actually happening is that he is starting to learn to listen. He can select certain sounds and memorize them. When he hears that sound again, he can match it with the one he has heard before. These skills are basic to all learning. At the same time these early hearing and language skills get under way, the child begins to practice making sounds. His first sounds are the discomfort sounds. These sounds are heard when he is not quiet or sleeping. These sounds mean nothing to him yet. To his mother they say he is wet, uncomfortable, or hungry. Within the baby's first month, another sound appears: the comfort sounds. These are different from the discomfort sounds. As the child grows, his comfort sounds will use more of the vowels and consonants and rhythms which he will later use. These sounds will come together to form the first word. The special event will be long remembered by the proud parents. Why does a newborn baby have to spend the first year of his life learning to listen? 细节题。文中提到：A newborn child comes equipped with a finely tuned pair of ears, but he doesn't yet know how to use them. 由此可知C“耳朵未发育完全”和D“想知道如何使用耳朵”都与之不符，是错的。结合后面提到的“the hearing center of his brains is still immature”得出结论：新生几之所以要用第一年的时间学习听音是因为虽然他们耳部发育已经成熟，但他们大脑的听力中心却没有发育成熟，故B项正确。