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

It is difficult to imagine what life would be like without memory. The meanings of thousand of everyday perceptions,

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问题     It is difficult to imagine what life would be like without
memory. The meanings of thousand of everyday perceptions,                【S1】______
the bases for the decisions we make, and the roots of our habits
and skills are to be found in our past experiences, that are brought     【S2】______
into the present by memory.
    Memory can defined as the capacity to keep information               【S3】______
available for later use. It includes not only
"remembering" things like arithmetic or historic facts, but
also involve any change in the way an animal typically                   【S4】______
behaves. Memory is involved when a rat gives up eating grain
because it has sniffed something suspiciously in the grain               【S5】______
pile. Memory is also involved when a six-years-old child                 【S6】______
learns to swing a baseball bat.
    Memory exists 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 interested to compare the memory-storage capacity of               【S7】______
a computer to that of a human being. The instant-access                  【S8】______
memory of a large computer may hold up to 100,000
"words" ready for instant use. An average U.S. teenager
probably recognize the meaning of about 100,000 words of                 【S9】______
English. However, this is but a fraction of the total amount
of information which he has stored.
    The use of words is the basis of the advanced
prob-lem-solving intelligence of human beings. A large part of a
person memory is in terms of words and combinations of                   【S10】______
words.
【S3】
选项
答案∧ defined→ be
解析 助动词缺失。memory和define之间是动宾关系，因此要用被动语态is defined；但前面有情态动词can，所以应是情态动词的被动语态can be defined。因此，在defined前要加上be。
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