题干
It is generally accepted that Chinese were the earliest ________ football while the European established the modern rules for football.
A：played
B：playing
C：to play
D：having played
答案(点此获取答案解析）
A
， 
， 
， 
， 
和 
， 
， 
， 
， 
，若第一周这五天的平均最低气温为7℃，则第二周这五天的平均最低气温为多少？