问题
单项选择题
A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fractions of a yard ？（）
A.A
B.B
C.C
D.D
E.E
答案
参考答案：D
解析：
如下图所示，该管子将沿[*]码处被切开：
[*]
由图可知，该管子被切成了六段，其中两两相等，所以共有[*]三种长度。