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 can not【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.With out this【C19】______reinforcement，says Dr.Simms，children cannot form【C20】______memories of their personal experiences.

【C1】（）