document.write ("<b>上一篇</b>：<a href='/DocHtml/1039/2015/1/4/6463056228501.html'>Unit 7 Will people have robots ?</a><br><b>下一篇</b>：<a href='/DocHtml/1039/2015/1/4/5654187828499.html'>3.1一元一次方程及其解法</a>")