题目

   Do you like watching the CCTV Spring Festival Gala (春节晚会)? It is said that it is welcomed and loved by people around the world. It is called the most delicious “New Year’s Eve Dinner”. The first CCTV Spring Festival Gala was held on February 12th, 1983. Do you know the information about directors, hosts and hostesses (女主持) and show numbers of the Spring Festival Galas in recent years? YearDirectorHost and hostessShow number2009Lang KunZhu Jun;  Zhou Tao; Dong Qing;  Bai Yansong; Zhang Zequn;  Zhu Xun35 2010Jin YueZhu Jun;  Zhou Tao Dong Qing;  Zhang Zequn; Ouy（2011•崇川区模拟）下列计算正确的是（ ）A．a6-a2=a4B．a6÷a2=a3C．a6•a2=a12D．（-a6）2=a12