You forgot the ;
at the end of your line.
<?php
$fille = simplexml_load_file("http://answers.yahooapis.com/AnswersService/V1/getQuestion?appid=dj0yJmk9OFRTTUI3NGdNNjREJmQ9WVdrOU5FZFBURzFqTkdNbWNHbzlNQS0tJnM9Y29uc3VtZXJzZWNyZXQmeD1iYg--&question_id=20080617101425AAmo159");
echo $fille->Question->Answers->Answer[0]->Content[0];
?>
More generally, when you face an error like Parse error: syntax error, unexpected XXX on line X
, check what's right before the line in question, it's mostly because you forgot something :)