【单选题】The customer is so angry that he or she isn’t prepared to work to solve the problem, doesn’t listen, and gets in the way of solving the problem. So the number one error is moving to solve the problem ...
【简答题】In the late 18th century, smallpox was one of the deadliest diseases in Europe. Dr. Edward Jenner studied many, many people who were suffering from smallpox but he made no progress. He felt stuck and ...