问答题
A.males are unable to do so B.males are afraid of being laughed at C.high pitch is a characteristic of female speech rather than male speech D.anatomy has proved that males tend to have lower pitches than females
A.The foundation of the Carnegie Steel Co. B.The introduction of Charitist ideals. C.The foundation of the J. Edgan Thomson Steel mills. D.Andrew Carnegie's trips to Great Britain.