Graphics, Figures & Tables ⇒ Table too wide with command 'xtable' using Sweave

[zhangtpku]

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\documentclass[11pt,a4paper]{article}
\begin{document}
<<Read>>=
library("Ecdat")
data(Schooling)

<<echo=FALSE,keep.source=TRUE,results=tex>>=
library(xtable)

print(xtable(summary(Schooling)))
\end{document}

When I use xtable to tabulate the summary of Schooling, the table is too wide to be displayed on the page. How do I solve this problem?
THX!