A straight pipe 1 yard in length was marke
题型：单项选择题
问题：
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
