8250串行通信芯片中用于指定串行异步通信的数据格式的寄存器是______。

A) 发送保持寄存器
B) 通信线状态寄存器
C) 接收缓冲寄存器
D) 通信线控制寄存器

用括号内所给词的适当形式填空（5分）

小题1:These are her ______ (brother).

小题2:_____ (she) ruler is under the chair.

小题3:_____(my)am a girl. My English name is Gina.

小题4:_____(this)are my grandparents.

小题5:Bob and I _____(be) friends.

小题6:This is my book, not _______(you).

小题7:These are two ______(watch).

小题8:This is ______(they) room.

小题9:The eraser is on _____(Bob) desk.

小题10:_____(that) are my brother and sister.