Decisionmakersmusthavesomewayofdeterminingofseveralalternativesisbest.（）
Robots,___(become)increasinglyprevalentinfactoriesandindustrialplantsthroughoutthedevelopedworld,areprogrammedandengineeredtoperformindustrialtaskswithouthumanintervention.
Expertshavefoundthatnormalsleepcanbedividedintofive______stages