下列不属于设立旅行社必须具备的条件是（）。
A.固定的营业场所
B.必要的营业设施
C.一定数量的经营人员
D.规定的注册资本和质量保证金
参考答案：C
Tom took a taxi to the airport, only _____ his plane high up in the sky.
A．finding
B．to find
C．being found
D．to have found
什么是裂纹的快速扩展?
