第22题: [单项选择]In this passage the author puts an emphasis on ______. A. the effect of smoking among children B. the difficulty in preventing children from smoking C. the reasons why children start smoking among children D. the measures to ban smoking among children 参考答案:B 答案解析:本题为主旨题。文章第一段提及学童抽烟的危害;第二段述及其原因;而第三段及第四段则侧重讲述防止学童染上抽烟的恶习之难,即使采取一些措施,也未必能收到预期的效果。 B项内容是文章的侧重点。