题目

Think of a simple object—a piece of chalk, for example. Are you remembering its name, its shape, its color or its size? Are you remembering what it is used for, or the sound it makes when the teacher writes on the blackboard? Scientists say that memory includes different parts of the brain, such as language and the ability of sense. They believe that you begin to create a memory when you notice something with your senses. Then, messages are sent to different brain cells, which join together to form connections. A new connection goes into your short-term memory. It is stored there for about 3求n个相同因数的积的运算叫做______．乘方的结果叫做____，在中，a叫做________，n叫做________．