单项选择题A. sales representativeB. travel agentC. product designerD. secretaryE. market researcherF. receptionistG. public relations officerH. personnel officer

A. sales representative
B. travel agent
C. product designer
D. secretary
E. market researcher
F. receptionist
G. public relations officer
H. personnel officer

单项选择题The writer suggests that（）

A．effective negotiations do not necessarily involve risks.
B．threats are sometimes impressive and effective;
C．people seem to prefer tough styles of negotiation.
D．risks are caused by negotiators’ overconfidenc