单项选择题
A．In B．To C．By D．On
A．Effect of Education B．Dependence on Environment C．Intelligence D．Surroundings
A．He doesn"t sell tea or washing powder any more. B．He must try hard to remember the names of the regular customers. C．He has to give advice and make decisions when problems arise. D．He has to take care of a large staff as well as business.