The noise pollution survey revealed a rather surprising and possibly amusing old fashioned source of noise. It turned out to be snoring! Men were found to be the worst offenders. It was revealed that 20% of men in their mid-thirties snore. This figure rises to a staggering 60% of men in their sixties.Against these figures, it was found that only 5% of women snore regularly.(这个有关噪音的污染调查还揭示了一种出人意外而同时可能会引人意外而同时可能会引人发笑的老式噪音源。它竟然是鼾声。人类是这方面的罪魁祸首。调查指出,20%的35岁左右的男人打鼾。而到60岁这个年龄段,这个数字上升到令人惊愕的60%。与这些数字相比,只有5% 的女性经常打鼾;)——《新概念英语》
1,难道这里面的“ It was revealed”中的“it”是形式主语?但“it”做形式主语时句型为 it’s +形容词/名词+that +从句, 这里的“revealed”明显是过去分词不是形容词啊?
2,同理,这里的也用了被动“it was found”,为什么?