In his book The Principles of Language Study (1921), Palmer made the point that ______were brought into play in the acquisition of spoken language whereas studial capacities were required in development of literacy.

A．learning power

B．grammatical capacities

C．spontaneous capacities

D．understanding capacities

照相印刷术是1852年由法国人（）发明的。

A.奥森巴赫

B.勒梅西埃

C.霍伊

D.莫诺