单项选择题
There is a high job mobility among young people as they will （） work one day and find a new job the next.
A．depart B．reject C．quit D．leave
单项选择题 Sometimes artists find it hard for their works to win popular （）.
单项选择题 Concerned people want to （） the risk of developing cancer.
单项选择题 Chemistry is closely （） with other studies: physics, biology and so on.
