是否可以让下面的代码预览页面而不是最新的分类帖子？

<div class="one_third_last">
  <h2>Gift Vouchers</h2>
  <div class="entry">   
<?php
//The Query
query_posts(\'posts_per_page=1&cat=7\');
//The Loop
if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
   <?php if ( has_post_thumbnail()) the_post_thumbnail(\'medium-thumbnail\'); ?>
<h3><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h3>
<a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><small><?php the_time(\'F jS, Y\') ?></small></a>
  <p><a rel="bookmark" href="<?php the_permalink(); ?>"><?php echo strip_tags(get_the_excerpt());?></a></p> 
</div>
<?php endwhile; else: ?>
    <p>Sorry, no posts matched your criteria.</p>
<?php endif;
//Reset Query
wp_reset_query();
?>
    </div>