【答案与解析】本文是一篇说明文,主要介绍了空气污染对儿童健康的危害及其产生的原因和一些防止措施28.C段落大意题。根据第二段的内容可知,第二段主要讲的是空气污染对儿童健康的有害影响29.A推理判断题, Strong根据第三段“ action to reduce exposure to air pollution offers chance to protect the health of children.”可推断,世界卫生组织认为应该减少暴露在空气污染中30.B推理判断题,根据第四段Poor countries in these areas have the highest levels of exposure to household air pollution due to the use of polluting fuels and technologies for basic needs like cooking, heating and lighting.”及最后一段“Advised approaches to dealing with air pollution include cleaner transport, cleaner cooking and heating fuels and technologies..”可推断,不清洁的烹调和取暖燃料最有可能会导致家庭空气污染31.B文章出处题。本文介绍了空气污染对儿童健康的危害及其产生的原因和一些防止措施由此可推断,本文最有可能出自报纸上的“环境”板块。