精选优质文档-倾情为你奉上Unit 11. Most cities in the country have introduced “Clean Air Zones” whereby factories and households are only allowed to burn smokeless fuel.2. He knows that the pursuit of social status can consume vast amounts of his time and effort.3. The doctors are at a loss because so far no medicine has been found to inhibit the spread of the disease.4. We see many special education directors trying to maintain the quality of their programs with much less money and much
