单项选择题
Why does the speaker say we should reject stereotypes（）
A．They force people to follow the cultural mainstream. B．They exaggerate the roles of certain groups of people. C．They emphasize diversity at the expense of uniformity. D．They hinder our perception of individual differences.
单项选择题 What problem does Alberto say Brazil faces now（）
单项选择题 What did Wilma Subra do as part of her job while working at Gulf South Research Institute（）
单项选择题 From the research conducted by the communications provider Inter-Tel, we learn that（） .
