请帮忙分析下句子
One should be careful, however, of supposing that silent reading came about simply because reading aloud was distracting to others. Examination of reasons connected with the historical development of silent reading shows that it became the usual mode of reading for most adult reading tasks mainly because the tasks themselves changed in character.
1 One should be careful, however, of supposing that 这是什么句式...不懂
2 Examination of reasons这是什么意思
3 剩下的怎么翻译?单词都简单,句子结构也明白但是感觉意思很怪