单项选择题
A．they failed to get the melons away without being seen B．they forgot to have their truck checked before they started C．they had got too many melons on the truck D．they knew they had a bad reputation
A．to help patients recover B．to increase the number of heart surgeries C．to get back the money spent on the equipment D．to buy new equipment for the treatment of heart disease
A．It has reduced the costs of medical treatment. B．It has helped save the lives of most patients. C．It has encouraged doctors to do more heart surgeries. D．It have helped educate people about the prevention of heart disease.