单选题 To be a qualified sharp-shooter, Tim has been practicing aiming at both of the ______targets and the moving targets.
A. standing
B. quiet
C. still
D. stable

【正确答案】 C

【答案解析】这句话的意思是说，为了成为合格的狙击手，蒂姆一直以来都在练习瞄准移动靶和固定靶。(A)standing站立不动的；(B)quiet安静的；(C)still静止不动的；(D) stable稳定的、稳固的。此处与moving对比，强调一动不动的，故选(C)。