Questions 6 and 7 are based on the following news. At the end of the news item, you will be given 20 seconds to answer the questions. Now listen to the news. Minutes after the first blast, a roadside bomb ______.
A．struck a bus on a highway on the eastern outskirts of Tikrit B．struck a truck on a highway on the western outskirts of Tikrit C．struck a truck on a highway on the eastern outskirts of Tikrit D．struck a car on a highway on the western outskirts of Tikrit