外语系打算举行一次茶话会(tea party)，庆祝程教授从事英语教学30周年(anniversary)。茶话会定于下周五即6月20日7时举行。请你写信邀请Brown教授参加，并以愉快的心情盼望他的光临。

A. governments and companies had different opinions about the safety of products
B. governments paid little attention to the safety of products
C. government officials often did not listen to scientists
D. in the past no safety laws were introduced by governments