单项选择题
The special departments protect customers and workers in many ways except by（）
A．testing new products B．designing new products C．controlling the sale of product D．inspecting work places
单项选择题 According to the passage, the sloth will move about when（）
单项选择题 Which of the following is NOT true about the sloth（）
单项选择题 Which of the following is NOT mentioned or implied by the author（）
