题目

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。Chengdu has dozens of new millionaires, Asia's biggest building, and great new hotels. But for tourists like me, pandas are its top 【1】 (attract).So it was a great honour to be invited backstage at the not-for-profit Panda Base, where ticket money helps pay for research. I 【2】 (allow) to get close to these cute animals at the 600-acre centre. From tomorrow, I will be their UK ambassador(大使).The title will be 【3】(official) given to me at a ceremony in London. But my connection with pand空间直角坐标系中，点A（-3，4，0）和点B（2，-1，6）的距离是（ ）A．B．C．9D．