下面是2014年6月英語六級閱讀真題長難句解析(17)，請考生仔細分析句子結構。
　　1. Finally, advertisers try to begin commercials with sounds that are highly different from those of the programming within which the commercial is buried. (1998. 閱讀. 6. Text 3)
　　【譯文】最后，廣告商費盡心機使廣告開始的聲音不同于其他節目的聲音。
　　【析句】復合句。主句advertisers try to begin commercials with sounds,隨后是that引導定語從句that are highly different from those of the programming修飾sounds,而定語從句中the programming后也有which引導的定語從句修飾。
　　2. But the developing countries may be impoverished, with populations growing so rapidly that using the land is a means to temporarily avoid worsening poverty and starvation. (1998. 閱讀. 6. Text 4)
　　【譯文】但是，隨著人口迅速增長，只能賣出土地以暫時避免貧苦和饑荒惡化，發展中國家可能會因此一貧如洗。
　　【析句】復合句。主句the developing countries may be impoverished,with populations growing so rapidly that...是with引導伴隨狀語。可以看出，with伴隨狀語中運用了so...that...詞組，而that引導句子using the land is a means to avoid...。
　　3. And many naturally produced chemicals, though occurring in tiny amounts, prove in laboratory tests to be strong carcinogens-a substance which can cause cancer. (1999. 閱讀. 1. Text 1)
　　【譯文】盡管許多自然生成的化學物質分泌量極小，但實驗證明卻是強致癌物——可引起癌癥的物質。
　　【析句】復合句。主句many naturally produced chemicals prove in laboratory tests to be strong carcinogens。主語many...chemicals后，though occurring in tiny amounts作讓步狀語從句，因為從句和主句主語相同，所以省略了主語。破折號后a substance是carcinogens的同位語，并且which can cause cancer作定語從句修飾a substance。