在8237A中传送数据的地址改变可以是( )。
A．加1
B．加3
C．减3
D．减3
参考答案：A
解析：[分析] 地址一般只能加1转移到下一地址。
正方形、圆、正三角形3种图形的对称轴的个数从多到少排列顺序为______．
— I haven't got the reference book yet, but I'll have a test on the subject next month.
— Don't worry. You ____ have it by Friday. [ ]
A. could
B. shall
C. must
D. may
