The above experiment shows that not all the information which is received can be retained for even a second. The informati

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问题        The above experiment shows that not all the
   information which is received can be retained for even
   a second. The information is taken in all right, and                         【S1】______
   immediately thereafter, most of it is lost and can not
   be recalled. Only a small part can be retained for
   future use. Now this immediate-forgetting is not an
   isolated phenomenon occurs only in the psychological                         【S2】______
   laboratory, h is, rather, the fate of most of the
   information which human beings are constantly
   receiving. Information is taken in, and the bulk of
   it vanishes within a second and so. On the whole, this                       【S3】______
   immediate-forgetting is advantageous. Most of the
   information taking in during the daily round is of                           【S4】______
   momentary value only. It serves to keep us abreast
   of the ever-changing relationships among                                     【S5】______
   ourselves and our environment and, this service
   rendered, its further retention would merely obstruct
   the ongoing flow of our activities. It is necessary                           【S6】______
   to retain every minute detail of immediately past
   circumstances; and indeed, if we did retain these
   details this would deprive us freedom to consider the                         【S7】______
   detailed requirements of the present moment. In all of
   life’s activities, we take in, from one moment to the
   next, a great deal of information which value is                              【S8】______
   restricted to the moment of its intake. So it is
   altogether an economy such information be forgotten                           【S9】______
   immediately. It is an economy that is selected for                            【S10】______
   more lasting retention be only those minima
   outstanding characteristics likely to be of future value.
【S10】

选项

答案is前加what

解析 仔细分析该句后,我们可发现is selected for more lasting retention缺土语,而代词what可充当主语。
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