The languages of uncivilized groups as compared with Western languages are limited in______.

A．the machinery for vocabulary expansion
B．possessing their own sound patterns
C．machinery for the transfer Of ideas
D．surprisingly complicated distinctions in degree of remoteness

A．to prove the high technology has a promising future
B．to support his assumption of new type of teamwork in the preceding paragraphs
C．to show that it tends to be an end to teamwork soon
D．to indicate the computer-assisted team effort just means investigation and simulation