```tex \documentclass[8pt]{extarticle} \usepackage[UTF8]{ctex} %\usepackage[paperwidth=21cm,paperheight=29.7cm,top=2.4cm,bottom=2.4cm,right=0.78cm,left=1.78cm]{geometry} \usepackage[paperwidth=21cm,paperheight=29.7cm,top=2.6cm,bottom=2.1cm,right=0.8cm,left=0.8cm,headheight=1cm,showframe]{geometry} \usepackage{tikz} \usepackage{fancyhdr} \setlength{\linewidth}{19.4cm} \makeatletter \newlength{\blk@height} \newlength{\blk@width} \newlength{\blk@cell@ht} \newlength{\blk@cell@dp} \newlength{\blk@cell@total} \newlength{\blk@cell@wd} \setlength{\blk@height}{\dimexpr\pagegoal-\pagetotal\relax} \setlength{\blk@width}{\linewidth} \setlength{\blk@cell@ht}{20pt} \setlength{\blk@cell@dp}{4pt} \setlength{\blk@cell@total}{\dimexpr\blk@cell@ht + \blk@cell@dp\relax} \setlength{\blk@cell@wd}{20pt} \newcommand{\drawBlocks}[1]{% \def\rowCount{#1}% \pgfmathsetmacro{\colCount}{floor(\blk@width / \blk@cell@wd)}% \\ \foreach \y in {0, ..., \rowCount} { \begin{tikzpicture} \draw (0, \y * -\blk@cell@total) -- +(\blk@cell@wd * \colCount, 0) ++(0, -\blk@cell@ht) -- +(\blk@cell@wd * \colCount, 0); \foreach \x in {0, ..., \colCount} { \draw (\x * \blk@cell@wd, \y * -\blk@cell@total) -- +(0pt, -\blk@cell@ht); } \end{tikzpicture} \ifnum\y=\rowCount \relax \else% \\[4pt] \fi% }% } \makeatother \pagestyle{fancy} \lhead{\rule[0mm]{5mm}{5mm}} \chead{\rule[0mm]{5mm}{5mm} {\hbox to 53mm{}} \rule[0mm]{5mm}{5mm}} \rhead{\rule[0mm]{5mm}{5mm}} \lfoot{\rule[0mm]{5mm}{5mm}} \rfoot{\rule[0mm]{5mm}{5mm}} \renewcommand{\headrulewidth}{0pt} \renewcommand{\footrulewidth}{0pt} \setlength{\tabcolsep}{0.pt} \raggedbottom \begin{document} \noindent 12.写作表达\quad\\[0pt]从下面两题中任选一题，按要求完成任务。\quad\\[0pt]\indent \textbf{题一：开在心中的花朵}\quad\\[0pt]\indent \textbf{题二：我最想感谢的人}\quad\\[0pt]\indent 要求：\textcircled{1}不少于600字；\textcircled{2}书写工整，语句通顺，勿写错别字；\textcircled{3}有事例，有真情实感。\quad\\[0pt] \drawBlocks{51} \end{document} ``` 页眉的内容怎么和底部的线对齐。