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  3. It is difficult to imagine what life would be like without memory. The meanings of thousands of everyday perceptions, the bases【

It is difficult to imagine what life would be like without memory. The meanings of thousands of everyday perceptions, the bases【

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问题     It is difficult to imagine what life would be like without memory. The meanings of thousands of everyday perceptions, the bases【56】the decisions we make, and the roots of our habits and skills are to be【57】in our past experiences ,which are brought into the present【58】memory.
    Memory can be defined as the capacity to keep【59】available for later use. It includes not only "remembering" thing like arithmetic or historical facts, but also any change in the way an animal typically behaves. Memory is【60】when a rat gives up eating grain because he has sniffed something suspicious in the grain pile. Memory is also involved when a six-year-old child learns to swing a baseball bat.
    Memory【61】not only in humans and animals but also in some physical objects and machines. Computers, for example, contain devices for storing data for later use. It is interesting to compare the memory-storage capacity of a computer【62】that of a human being. The instant-access memory of a large computer may hold up to 100, 000" words" ready for【63】use. An average American teenager probably recognizes the meanings of about 100, 000 words of English. However, this is but a fraction of the total【64】of information which the teenager has stored. Consider, for example, the number of facts and places that the teenager can recognize on sight. The use of words is the basis of the advanced problem-solving intelligence of human beings. A large part of a person’s memory is in terms of words and【65】of words.
选项 A、exists
B、appears
C、affects
D、seems
答案A
解析 这道题里也有四个动词，用做句中的谓语。由于这一动词后面只有以in开头的介词短语，所以 C不能用，因为C项是及物动词，需要宾语。D也不能用，因为D是联系动词，与后面的介词短语的意思连不上。在A、B两项中，A明显的比B更符合句子的意思。
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