题目

Eddie Mckay,a once-forgotten pilot,is a subject of great interest to a group of history students in Canada. It all started when Graham Broad,a professor at the University of Western Ontario,found McKay’s name in a footnote in a book about university history. McKay was included in a list of university alumni (校友)who had served during the First World War,but his name was unfamiliar to Broad,a specialist in military history. Out of curiosity,Broad spent hours at the local archives (档案馆)in a fruitless search for information on McKay. Tired and discouraged,he finally gave up. On h6、某射击运动员在一次比赛中，前6次射击52环，若他要打破89环（10次射击的记录），第7次射击的环数不能少于（　　）A、6环B、7环C、8环D、10环