单项选择题
A．with a moment of sudden realization of inspiration B．with the knowledge of what is needed C．after you have climbed some muntains D．when you have climbed some mountains
A．Never be satisfied with what you have. B．Start a business as a customer. C．It is profitable to find fault with what you have. D．To start a business is to make a fortun
A．they were too soft to bear the climber's weight B．they were the only pitons he could afford to buy C．they coul not last long D．they were made of iron