Distinctive sound refers to ______.

单项选择题The main rivers parting in Britain run from ______.

单项选择题is the central concern to Blake's concern in the Song of Innocence and Song of Experience.

单项选择题In 1964-1966, major resource of natural gas were discovered in the British sector of ______.

单项选择题Which of the following ways of word-formation doesn't change the grammatical class of the stems

单项选择题The Franklin Roosevelt came into power in the period of ______.