单项选择题
What is one of the problems in the Biramichi River（）
A．Lack of oxygen. B．Overgrowth of water plants. C．Low water level. D．Serious pollution upstream.
单项选择题 What do we learn from the conversation（）
单项选择题 What did the woman say about her presentation（）
单项选择题 What kind of will do most people leave behind ac- cording to the passage（）
