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顺序执行以下命令之后，最后一条命令的输出结果是 X = [A] Y = X A = [长江黄河] X + &X – Y - &Y
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以下不宜作深刺的是
只清空当前表HGZ.DBF中奖金字段的全部值，应当使用命令
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
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（）
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