¡¡¡¡Which of the following is an assumption on which the argument depends£¿
¡¡¡¡£¨A£© Switching to cleaner-burning fuel will not be more expensive than installing scrubbers.
¡¡¡¡£¨B£© Northern Power can choose from among various kinds of scrubbers£¬some of which are more effective than others.
¡¡¡¡£¨C£© Northern Power is not necessarily committed to reducing harmful emissions from its plants.
¡¡¡¡£¨D£© Harmful emissions from Northern Power's plants cannot be reduced more by using both methods together than by the installation of scrubbers alone.
¡¡¡¡£¨E£© Aside from harmful emissions from the smoke-stacks of its plants£¬ the activities of Northern Power do not cause significant air pollution.
¡¡¡¡12.In 1990 all of the people who applied for a job at Evco also applied for a job at Radeco£¬and Evco and Radeco each offered jobs to half of these applicants cants. Therefore£¬every one of these applicants must have been offered a job in 1990.
¡¡¡¡The argument above is based on which of the following assumptions about these job applicants£¿
¡¡¡¡£¨A£©All of the applicants were very well qualified for a job at either Evco or Radeco.
¡¡¡¡£¨B£© All of the applicants accepted a job at either Evco or Radeco.
¡¡¡¡£¨C£© None of the applicants was offered a job by both Evco and Radeco.
¡¡¡¡£¨D£© None of the applicants had applied for jobs at places other than Evco and Radeco.
¡¡¡¡£¨E£© None of the applicants had perviously worked for either Evco or Radeco.
