In English, certain nouns are spelt with _____capital letter at _____ beginning of the word; for example, names of places, such as the United States of America.

A．a; the

B．the; the

C．a; a

D．the; a

直接暴力所致的肋骨骨折，多为横形/粉碎骨折，骨折片多向（）移位。