小题1:How to protect yourself when you travel.
小题2:But the protection provided by air bags is limited in side or rear crashes; effective as they are, they can’t take the place of safety belts.
小题3:Air bags are important.
小题4:Air bags.
小题5:The second suggestion. Because a belt can reduce the chance of fatal injury by 45% and the chance of serious injury by 50%.