In case you wondered on how to change the structure of the meta-description of a page, here's how...
The default construction is: "a few words from the start" ... "few words from the end".
So if you only want that the description gives you the first x number of words from the start of a question (which is usual), then..
Go to qa-util-string.php.
Change at line 512 the value after $tosuffix=(($addword%... to an higher number, let's say 35.
Then go a bit down, at line 530, change this:
$string=$prefix.' ... '.$suffix;
So in the end the description of every page will be only the first couple of words of the questions.
Btw, you can output the description of a page by using qa-theme.php this function: