Shooting, as means of survival originally, developed into sport only in the late 19th ce

Shooting, as means of survival originally, developed into sport only in the late 19th century.
A. a; a
B. the; the
C. a; the
D. the; a

(答案→)A. a; aB. the; the C. a; theD. the; a解析：考查冠词用法。第一个的means表示方法，是一个可数名词，用a表示泛指。第二空的sport指体育运动，也是可数名词，使用a表示泛指。句意：射击，原来昨晚一种生存的方法，在19世纪后半叶成为一种体育运动。故A正确。

这个解释是对的