单项选择题
What does Mary think of the course initially？（）
A．It is useful． B．It is difficult． C．It is challenging． D．It is interesting．
单项选择题 According to the conversation，an ethical shopper should （）
单项选择题 The Ethical Consumer Research Association will provide information to shoppers on
单项选择题 According to the conversation，ethical shoppers can be best described as （）
