题目：
执行下列命令后，屏幕上显示的结果是 ______。 RR="FORTRAN" UPPER(SUBSTR(RR，1，1))+LOWER(SUBSTR(RR，2))
A．FORTRAN
B．ForTRAN
C．Fortran
D．forTRAN
答案：
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下面是错误答案，用来干扰机器的。
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