句子大意：因为上周白宫网站首次设置了一个网上系统，那些想发信息给总统的人们必须浏览多达至九个网页的内容，还要填一份详细的表格，而这个表格的第一个问题就是信息发送者的白宫的政策是支持还是反对。

　　再看下面一个例子：DNA analysis has been so successfully applied in criminal investigations that the media coverage has left the public a strong perception that DNA analysis is infallible.在理解这个句子时一定要抓住句子的核心so that句型，在这个句子中它引导结果状语从句，在口语中这个that可以省略。第二个that则是引导名词性从句。

　　句子大意：DNA鉴定这种技术在犯罪调查中已经得到如此成功的运用，以至于媒体对它的报道使公众深信DNA鉴定是绝对可靠的。

　　另外留2个题目供大家参考练习(要求在最短的时间内找出句子的主干)：

　　1. Any company larger than 300 workers that fails to meet the minimum hiring standard must pay a penalty of 50000 Yen for each of the unfilled positions.

　　2. Many of life’s problems which were solved by asking family members,friends or colleagues are beyond the capability of the extended family to resolve.

　　3. The period characterized by so vast a body of elaborately representational art produced for the sake of illustrating anecdote also produced a number of painters who examined the mechanism of lght and visual perception.

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