阅读材料，回答题。 It is difficult to imagine what life would be like without memory. The meanings of thousarof everyday perceptions, the bases for the decisions we make, and the roots of our habits and skiare to be found in our past experiences, which are brought into the present by memory. Memory can be defined as the capacity to keep information available for later use. It inclucnot only "remembering" things like arithmetic or historical facts, but also involving any change the way an animal typically behaves. Memory is involved when a rat gives up eating grain becathe has sniffed something suspicious in the grain pile. Memory is also involved when a six-year-(child learns to swing a baseball bat. Memory exists not only in humans and animals but also in some physical objects and nchines. Computers, for example, contain devices for storing data for later use. It is interesting compare the memory-storage capacity of a computer with that of a human being. The instant-accmemory of a large computer may hold up to 100,000 "words"--ready for instant use. An aver U.S. teenager probably recognizes the meaning of about 100,000 words of English. However, is but a fraction of the total amount of information which the teenager has stored. Consider, for ample, the number of faces and places that the teenager can recognize on sight. The use of words is the basis of the advanced problem-solving intelligence of human bein A large part of a person&39; s memory is in terms of words and combinations of words. According to the passage， memory is considered to be__________ 查看材料