\usepackage{fontspec,xunicode}
%% VERY IMPORTANT. Configures supported languages and fonts to use for each one.
\usepackage[Latin, Hebrew, Arabics, CJK, Diacritics]{ucharclasses}
-\newfontfamily{\normalfont}{FreeSerif}
+\newfontfamily{\normalfont}[Ligatures=TeX]{FreeSerif}
\newfontfamily{\cjkfont}{WenQuanYi Zen Hei}
\setDefaultTransitions{\normalfont}{}
\setTransitionsForLatin{\normalfont}{}