单项选择题

The author says that professional linguists recognize that______.

A．Western languages are superior to Eastern languages
B．all languages came from grunts and groans
C．the hierarchy of languages is difficult to understand
D．there is no hierarchy of languages
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单项选择题
The languages of uncivilized groups as compared with Western languages are limited in______.
A．sound patterns
B．grammatical structures
C．vocabularies
D．ability to transfer ideas
单项选择题
The examples given by the writer in Paragraph 5 serve______.
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
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