In TG, the structure that contains all the unit and relationships that are necessary fro interpreting the meaning of the sentence is ______.

A．a megacity with slums.
B．a palace of hunger and conflict.
C．an industrialized city.
D．a rural area with a surplus population.

A．They do not buy it any more, instead they buy products of finest lambs wool.
B．They don’t care about the rise of price and still buy them as they did before.
C．They try to balance their budget by buying one sweater less.
D．They at least buy one because of its wonderful softness.