填空题

The major cause of "forgetting" is failure to learn the material (36) in the first place. However, we forget at a (37) rapid rate even material that we have learned. Recent research indicates that memories don’t just (38) away. Instead, new learning (39) with recall of old learning. In your mental (40) system, new learning (41) up old memories, making them harder to (42) . If you learn American history and then English history, it will be harder for you to remember American history (43) if you have learned nothing else. (44) . But if you remain awake for the same eight hours, you will forget up to twice as much. (45) .If you take Spanish your freshman year and French your sophomore year, you will find Spanish words interspersed in your French conversation. If you can’t reduce interference by sleeping after each study session, it’s a good idea to include breaks between subjects. (46) .