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单项选择题
HTML文档都必须包括、
、这三种元素，其文件基本架构中
指明（）</p><p>A.文件头开始</p><p>B.文件头区内容</p><p>C.文件开始</p><p>D.正文区开始</p>
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<p>参考答案：<b>B</b></p> </div>
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<a href="https://app.ixiawen.com/question/208977/e88537b9662c659ae7091dfa26296f9e.html" class="black" target="_blank"><p>A省B市D房地产开发公司2006年通过房地产开发一级资质，同年还获得了正常利润，其商品房销售收入也达到了4600万元。2012年3月，D房地产开发公司取得了B市城市规划区内的一块住宅建设用地使用权，总投资为1亿元。为有效做好此项目的某旧办公楼拆迁，D房地产开发公司聘请B市二级资质E房地产估价有限公司对该旧办公楼进行了拆迁估价。经估价，该旧办公楼评估价为2100万元。同时经D房地产开发公司要求，E房地产估价有限公司还完成了该项目的市场分析报告。据此，请回答以下问题：<br></p><p>按照经济学原理，D房地产开发公司2006年的经济成本已达到了( )万元。</p><p>A．2300</p><p>B．4600</p><p>C．6900</p><p>D．9200</p></a>
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<a href="https://app.ixiawen.com/question/20658601/d86befd1dc1d737d0a1a9a4177862401.html" class="black" target="_blank"><p>22.Some people are worrying about the possibility ________ cellphones could be responsible for a range of illnesses, from rashes to brain tumors.</p><p>A．that</p><p>B．why</p><p>C．how</p><p>D．Whether</p></a>
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