功率频率电液控制系统是以连续的电量对机组进行控制的，所以也称( )。

According to the passage, the language of primitive cultures was ______.

A．nonexistent

B．only spoken by Eskimo

C．simple-minded

D．elaborate and complicated

According to the author, people of undeveloped cultures can have languages.

A．complicated

B．uncivilized

C．primitive

D．well known

According to the author, people of underdeveloped cultures can have______ languages.

A．complicated

B．uncivilized

C．primitive

D．well-known

According to David Foote, what has helped the increase of new kinds of jobs？

A．Network related science.

B．Risk management.

C．Social media.

D．Marketing.

According to the text, one difference between Western and Eastern minds was that ______.

A．the world in Eastern thought is a line while in Western thought is a circle.

B．Western mind is more comprehensive than Eastern mind.

C．Western mind is more concerned of connections.

D．Eastern mind considers things more like a whole instead of separate parts.

According to the author, people of underdeveloped cultures can have______ language.

A．complicated

B．uncivilized

C．primitive

D．well-known

According to the author，people of undeveloped cultures can have__________ languages．

A.complicated

B.uncivilized

C.primitive

D.well．known

According to the author, Racism ______.

A．leads to a world with no variety

B．does not see the differences between cultures

C．hinders the world's economic development

D．does not tolerate coexistence of different cultures