※ [14～18]( ) .
(3 ) ： ： ( ) .
A．
B．
C．
D．
参考答案：D
A large number of farmers _____ become workers or businessmen, so the number of farmers
that ____ working in the fields is decreasing.
A. have, is
B. has, are
C. have, are
D. has, is
DV-AVI格式的文件扩展名一般是（）。
A、.rmvb
B、.rm
C、.mp4
D、.avi
