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During which time of the year did she work abroad？

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Part A
Suppose that you are the president of Peking University of Traditional Medicine and invite Prof. Hopkinson, an American medical expert, to attend a conference held in Beijing on 1st December, 2006. You want to write a letter of invitation to Prof. Hopkinson.
You should write appropriately 100 words. Do not sign your own name at the end of your letter. Use "Li Ming" instead. You do not need to write the address.

根据材料(一个教师的教案)分析该教师的教学观、教学目的观和教学方法。

请编制程序，其功能是：内存中连续存放着两个无符号字节序列AK和BK((K=0,1,……,9)，求序列CK，CK=AK-BK(CK以有符号字的形式按C0,C1……,C9的顺序连续存放)。
例如：
序列AK为：30H，FFH，80H，FFH…
序列BK为：00H，FFH，FFH，OAH…
结果CK为：0030H，000H，FF81H，FFF5H…
部分程序已给出，其中原始数据由过程LOAD从文件INPUT1.DAT中读入SURCE开始的内存单元中，运算结果要求从 RESULT开始存放，由过程SAVE保存到文件OUTPUT1.DAT中。
请填空BEGIN和END之间已给出的源程序使其完整，空白已用横线标出，每个空白一般只需一条指令，但采用功能相当的多条指令亦可，或删除BEGIN和END之间原有的代码并自行编程来完成所要求的功能。
对程序必须进行汇编，并与IO.OBJ链接产生可执行文件，最终运行程序产生结果。调试中若发现整个程序中存在错误之处，请加以修改。
[试题程序]
EXTRN LOAD:FAR,SAVE:FAR
N EQU 10
STAC SEGMENT STACK
DB 128 DUP()
STAC ENDS
DATA SEGMENT
SOURCE DB N2 DUP()
RESULT DW N DUP(0)
NAME0 DB 'INPUT1.DAT',0
NAME1 DB 'OUTPUT1.DAT',0
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA,SS:STAC
START PROC FAR
PUSH DS
XOR AX,AX
PUSH AX
MOV AX,DATA
MOV DS,AX
LEA DX,SOURCE ; 数据区起始地址
LEA SI,NAME0 ; 原始数据文件名
MOV CX,N2 ; 字节数
CALL LOAD ; 从"INPUT1.DAT"中读取数据
BEGIN
MOV DI,OFFSET RESULT ; 结果从RESULT开始存放
MOV BX,0
(1)
PRO: MOV AH,0
MOV AL,SOURCE[BX] ; 序列Ak中的一个字节
SUB AL, (2) ; Ck=Ak-Bk
(3) JUMP ; 无借位转JUMP
MOV AH, (4) ; 有借位转换成有符号字(为负)
JUMP: MOV (5) ,A
ADD DI,2
INC BX
DEC CX
JNZ PRO
; END
LEA DX,RESULT ; 结果数据区首址

&8226;The graph below shows the turnover for three kinds of retail outlet, all owned by the same company, during a three-year period.
&8226;Using the information from the graph, write a short report comparing the changes in turnover in the company's three types of outlet.
&8226;Write 120-140 words.