As a critic of music and drama, ________ held that art should serve social purposes by reflecting human life, revealing social contradictions and educating the common people.

A． T. S. Eliot

B．Oscar Wilde

C．George Bernard Shaw

D．W. B. Yeats

变配电所主接线路中“断路器”的文字符号表示为（）。

A、TA

B、FU

C、QF

D、QS