A.There were 311 competitors from 13 countries.
B.There were 1131 competitors from 113 countries.
S：Can I choose A？
T：That’s right.But you’d better use a complete sentence.
T：6.Who was China’s first gold medal winner and for what event？
A.Xu Haifeng；shooting　　B.Xu Haifeng；table tennis
S：Xu Haifeng was China’s first gold medal winner for shooting.
T：That’s very good.You gave us an excellent reply.
T：7.How many competitors from how many country take part in the 27th Summer Olympics in Sydney？