根据短文及所给提示填空，并注意词形变化。

Dear Editor,

     I 1_____ (拜访) our zoo yesterday and l was very 2_____ (吃惊的) to find hardly anyone there. Zoos are

very important places. They 3_____ (像) living textbooks for young people. They 4_____ (提供) homes for many 5_____ (濒危的) animals and help to 6_____ (教育) the public about 7_____ (关心) them. If we don't 8_____ (支持) our zoos, they won't have enough money to 9_____ (照顾) so many fine animals. I 10_____ (强烈要求) all of you readers to visit. our wonderful zoo soon.

                                                                                                                                      Sincerely,

                                                                                                                                   Animals' Friend

某商场的部门、员工和商品3个实体之间的关系如图5-6所示。假设每个部门有若干名员工，每种商品只能由一个部门负责销售，那么部门到员工、部门到商品之间分别存在 (65) 的关系。

A．1:1和1:1

B．1:1和1:n

C．1:n和1:1

D．1:n和1:n