单项选择题
A．reduces road accidents by more than half B．saves lives while driving at a speed up to 30 miles per hour C．reduces the death rate in traffic accidents D．saves more than 15,000 lives each year
A．Someone who is backing into a parking space. B．Someone who is picking up the children from the local school. C．Someone who is delivering invitation letters. D．Someone who is under 14.
A．to wear a seat belt for health reasons B．not to wear a seat belt for health reasons C．to get a valid medical certificate before wearing a seat belt D．to pay a fine rather than wear a seat belt