题目

 Henry's news report covering the conference was so _____ that nothing had been omitted.         A.understanding                                           B.comprehensible         C.comprehensive                                    D.understandable   答案：C空气是一种宝贵资源．在治理城市空气污染中所采取的措施不正确的是（　　）A．焚烧落叶，减少垃圾B．植树造林，增加绿地面积C．采用集中供热代替小煤炉D．汽车改用清洁燃料