单项选择题
Questions 23 and 24 are based on the following news．At the end of the news item．you will be given 10 seconds to answer the questions．Now， listen to the news．
The rescue efforts concentrated mainly on （）
A．the US-Canada border B．snow-stricken regions C．highways D．city streets
单项选择题 According to the conversation，an ethical shopper should （）
单项选择题 What does Mary think of the course initially？（）
单项选择题 At the end of the conversation．the speakers talk about （）
