GRE Text Completion: JiJing 1373-GRE填空机经1373题 - W5T236BGJT5SMNZHA

Computerized facial-recognition systems can be ____________ by any number of factors, from the dirt caked on a camera lens to a hat pulled low over a subject's face. A. neutralized B. calibrated C. augmented D. ameliorated E. stymied F. confounded