Template page with one post

Hello!
I’m new in php and I have some doubts…

I made a template page like that:
(A)

<?php if ( have_posts() ) while ( have_posts() ) : the_post(); ?>
<?php the_content(); ?> <strong>/*--> I received html text */</strong>
<?php endwhile; ?>

(B)

<?php query_posts('category_name=Blog&posts_per_page=1'); ?>
<?php while (have_posts()) : the_post(); ?>
<strong>/*--> I received the last post of category: Blog */</strong>
<?php endwhile; ?>

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It is OK but I want to insert firs B and then A.

Any help please?
thank you
<?php endwhile; ?>