The term ______ linguistics may be defined as a way of referring to the approach which studies language change over various periods of time and at various historical stages.

A. The Atlantic and GulfCoastal Plain.
B. The Appalachians and their foothills.
C. The interior lowlands.
D. The Cordiller

A．the development of science really can solve a great many of the problems on which philosophers still argue
B．Plato knew nothing about Physics
C．the scientists have achieved a lot in terms of light theory
D．different people have different ways of perception