GRE Text Completion: JiJing 1373-GRE填空机经1373题 - QWS5H48_7_GA7ZI_A

The science of astronomy was begun by amateurs and today remains dependent on their contributions, which are incisive by virtue of being ____________ by the a priori assumptions that often vitiate the work of professional research scientists. A. characterized B. unencumbered C. supported D. contradicted E. inspired