问题
单项选择题
In Township K, 
of the housing units are equipped with cable television. If 
of the housing units, including 
of those that are equipped with cable television, are equipped with videocassette recorders, what fraction of the housing units have neither cable television nor videocassette recorders ？（）
A.A
B.B
C.C
D.D
E.E
答案
参考答案：A
解析：
配有有线电视的住房的[*]配有录像机说明，有[*]的住房既有有线电视又有录像机，因此既没有有线电视，又没有录像机的比率为：
[*]