document.write ("<b>上一篇</b>：<a href='/DocHtml/1039/2015/1/4/2635694228503.html'>中 国 石 拱 桥</a><br><b>下一篇</b>：<a href='/DocHtml/1039/2015/1/4/6463056228501.html'>Unit 7 Will people have robots ?</a>")