The interactions between China and the U.S. will surely have a significant ______ on peace and stability in the Asia-Pacific region and the world as a whole.
 
【正确答案】 C
【答案解析】 本题考的是形容词与名词的搭配。A项意为“重要性”，B项意为“印象”，C项意为“冲击、影响”，D项意为“含义”。