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只清空当前表HGZ.DBF中奖金字段的全部值，应当使用命令

A. MODIFY STRUCTURE
B. DELETE
C. REPLACE
D. ZAP

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学生.DBF有学号(C,6)，姓名(C,8)，性别(C，2)，生日(D)四个字段，当前记录值是：“020101”，“张三”，“男”，02/10/84。执行下列命令： SCATTER TO XS LEN (XS(2) ) 结果是

A. 张三
B. 男
C. 4
D. 8

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Behavioral psychologists apprehend that conditioned fear responses to atone previously paired with a shock diminish, if the tone is repeatedly presentedwithout the shock, a process known as extinction. Since Parlor it has beenLine hypothesized that this extinction does not erase conditioning, but forms a new(5) memory. Research has now demonstrated that destruction of the infralimbiccortice blocks recall of fear extinction, indicating that it might store long-termextinction memory. Infralimbic neurons recorded during fear conditioning andextinction fire to the tone only when rats are recalling extinction on thefollowing day, and rats indicating the least fear responses also demonstrate the(10) greatest increase in infralimbic tone responses. Conditioned tones paired withbrief electrical stimulation of infralimbic cortex elicit low fear responses in ratsthat have not undergone extinction. Thus, stimulation resembling extinction-inducedinfralimbic tone responses is able to simulate extinction memory. According to the passage, "infralimbic neurons ... fire to the tone only when rats are recalling extinction on the following day" (lines 7-9) for which of the following reasons（）

A. Extinction has not been proven to erase the memory of fear conditioning in rats.
B. The extinction response requires a number of days to develop.
C. The subject's original fear response was not conditioned to a tone.
D. The infralimbic cortices carry the memory of fear extinction.
E. Rats that show the least fear demonstrate the greatest increase in infralimbic tone responses.

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在当前工作区已打开学生表，要求按男生在前，女生在后，同一性别的按年龄从小到大排序，生成新表SS.DBF，应使用命令

A. SORT TO SS ON 性别,出生日期 / D
B. INDEX TO SS ON 性别,出生日期
C. SORT TO SS ON 性别,出生日期
D. COPY TO SS ON 性别,出生日期 / D

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表文件已经打开，当前记录中姓名字段的值是“王小平”。执行以下命令序列姓名="李敏" 姓名屏幕显示的结果是

A. 王小平
B. 李敏
C. 王小平李敏
D. 李敏王小平

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只清空当前表HGZ.DBF中奖金字段的全部值，应当使用命令

A. MODIFY STRUCTURE B. DELETE C. REPLACE D. ZAP

学生.DBF有学号(C,6)，姓名(C,8)，性别(C，2)，生日(D)四个字段，当前记录值是：“020101”，“张三”，“男”，02/10/84。执行下列命令： SCATTER TO XS LEN (XS(2) ) 结果是

在当前工作区已打开学生表，要求按男生在前，女生在后，同一性别的按年龄从小到大排序，生成新表SS.DBF，应使用命令

表文件已经打开，当前记录中姓名字段的值是“王小平”。执行以下命令序列 姓名="李敏" 姓名 屏幕显示的结果是

A. MODIFY STRUCTURE
B. DELETE
C. REPLACE
D. ZAP

表文件已经打开，当前记录中姓名字段的值是“王小平”。执行以下命令序列姓名="李敏" 姓名屏幕显示的结果是