What's your earliest childhood memory? Can you remember learning to walk? Or talk? The first time you【C1】______thunder or watched a television program? Adults seldom【C2】______events much earlier than the year or so before entering school, just as children younger than three or four【C3】______retain any specific, personal experiences. A variety of explanations have been【C4】______by psychologists for this "'childhood amnesia"(儿童失忆症). One argues that the hippocampus, the region of the brain which is responsible for forming memories, does not mature【C5】______about the age of two. But the most popular theory【C6】______that, since adults do not think like children, they cannot【C7】______childhood memories. Adults think in words, and their life memories are like stories or【C8】______—one event follows【C9】______as in a novel or film. But when they search through their mental【C10】______for early childhood memories to add to this verbal life story, they don't find any that fits the【C11】______. It's like trying to find a Chinese word in an English dictionary. Now psychologist Annette Simms of the New York State University offers a new【C12】______for childhood amnesia. She argues that there simply【C13】______any-early childhood memories to recall. According to Dr. Simms, children need to learn to use【C14】______spoken description of their personal experiences in order to turn their own short-term, quickly【C15】______impressions of them into long-term memories. In other【C16】______, children have to talk about their experiences and hear others talk about【C17】______. Mother talking about the afternoon【C18】______looking for seashells at the beach or Dad asking them about their day at Ocean park. Without this【C19】______reinforcement, says Dr. Simms, children cannot form【C20】______memories of their personal experiences.