阅读下面的短文，文中有15处空白，每处空白给出4个选项，请根据短文的内容从4个选项中选择1个最佳答案，涂在答题卡相应的位置上。

　　Computers

　　Befor the widespread use of computers,managers could    (51)full use of large amounts of valuable information about a company's activities. The information either     (52)managers too late or was too expensive to be used.Today,managers are facing a wide     (53)of data processing and information instruments.Managers can draw on computer-based information systems to control      (54)in every area of their company.On any kinds of performance measures,the information provided by these systems helps managers compare standards    (55)actual results,find problems,and take proper action      (56)it is too late to make changes.

　　The     (57)of computerized(电脑化)information systems has sharply changed management control in many companies．Even a neighborhood shopkeeper may now use computers to     (58) sales,billing，and other activities．

　　Now．there are about 24 million microcomputers in      (59)in the United States-one for every 10 citizens．It is      (60)that by 1 996，6 1 percent of American managers will be using some sort of electronic work station．In order for managers to be sure that the computer-based information they are receiving is       (61)，they need to understand how computers work．However，in most       (62)they do not need to learn how to program computers．Rather，managers should understand how computerized information systems work；how they are      (63)；their limitations and costs；and the manner in which information systems may be used．          (64)an understanding is not dittlcult to achieve.

　　One research found that business firms were more successful in teaching       (65)information about computers to business graduates than they were in teaching business subjects to computer science graduates．

　　51 A take      B have     C  make    D get

　　52 A found  B changed     C  reached  D influenced

　　53 A district    B range      C  band    D aspect

　　54 A actions     B activities   C  acts   D activation

　　55 A with     B to     C  for    D by

　　56 A until     B before     C while   D when

　　57 A donation  B conversion  C auction  D introduction

　　58 A work     B reduce     C  control  D change

　　59 A use     B usage     C activity  D construction

　　60 A estimated   B taught  C called  D recommended

　　61 A innovative  B necessary C  accurate  D  strict

　　62 A occasions    B times   C  cases    D examples

　　63 A invented  B expanded  C modified   D developed

　　64 A That     B This      C  Such    D So

　　65 A complex    B basic     C  serious   D favorable