It is minor thing, but how can I avoid converting "_" to "." ?

e.g. I have a data set "test.csv"
 
A,A_B,A_C,C,D
X,11,0,13,14
Y,21,0,23,24

and when I read it all underscores are converted to dots (:<)

> d <- read.csv("test.csv")
> d
  A A.B A.C  C  D
1 X  11   0 13 14
2 Y  21   0 23 24


Ryszard
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