He is busy practicing _______English. [ ]
A. speaking
B. to speak
C. speak
答案：A
请先阅读下面短文，根据短文内容从下面方框内的七个选项中选择五个还原到文中，使短文意思通顺、结构完整。 （每小题2分）
Dear Judie ,
小题1:________? I'm writing to you from my school. This school is great ! 小题2:________. I like the teachers. The other students in my class are very friendly. They teach me Chinese and I teach them English.
There is a small river behind our school. 小题3:________ .We can swim in it.
小题4:________. We stay at home and watch TV. My father and my mother go to the shops on Sundays. They all like China.
I can speak Chinese now. 小题5:________ .
Please write to me soon!
Yours,
Bunny
A．There are no classes on Sundays
B．I love our teachers
C．I can write my name in Chinese
D．There are nine hundred students in my schoolE. How are you
F. The water is clean
G. We like playing basketball on Saturday afternoon
从计算机的逻辑组成来看，通常所说的PC机的"主机"包括
A． 中央处理器（CPU）和总线
B． 中央处理器（CPU）和主存
C． 中央处理器（CPU）、主存和总线
D． 中央处理器（CPU）、主存和外设
