登杆作业主要方法有（）。
A.脚扣登杆和登板登杆
B.脚扣登杆
C.登板登杆
D.脚扣登杆和人工登杆
参考答案：A
—Do you know _______ the MP3 player last week?
—Sorry, I have no idea. [ ]
A. how much did she pay for
B. how much will she pay for
C. how much she paid for
D. how much she will pay for
加法运算后的进位标志存放在中（）
A.状态标志寄存器F
B.程序计数器PC
C.累加器ACC
D.数据缓冲器DR
