Up until the time, his interest had focused almost ___________ on fully mastering the skills and the techniques of his crafts.

A．It is easily expanded.
B．It is naturally prevalent.
C．It is regenerative.
D．It can be exchanged in business dealings.

A．the sharp rise in information processing activities
B．a marked increase in information intensive activities
C．information as an economic resource
D．the establishment of information society