填空题 A. too much energy
B. based on American designs
C. they are too costly
D. they are not reliable
E. quality control
F. free of charge

填空题 Even the most sophisticated Japanese robots are 1.

填空题 Robots are less popular in Britain today partly because 1.

填空题 One disadvantage of using robots is that they consume 1.

填空题 The use of robots increases 1.