用1，2，3，4四个数能组成几个两位数？[ ]
A．6
B．8
C．12
答案：C
--- It is weeks since he ___.
---So it is. We’d better ask some one else to help us.
A．fell ill
B．was ill
C．is ill
D．has been ill
【问题1】 请分别说出(1)与(2)的设备名称。
