单项选择题 After years of ____ on costs and revamping the way it does business, American industry is reaping improvement in productivity.poundingC、 refiningD、 quelling

单项选择题 Cisco now handles 70% of the support calls it receives without human intervention , ______ the Web.

单项选择题 Conversely, if spending on computers ______ , that’s a sign that companies had little faith in the productivity benefits of information technology.