单项选择题
A．car-renting services in the US B．a special rate of car-renting C．the advantages of car-renting D．a US car-renting company
A．most old people die from accidents at home B．up to half of home accidents could be prevented C．falls at home can be avoided by taking some simple measures D．protection of old people should be the first concern for the public
A．you have to be responsible for the company B．you should obey the rules set by the company C．you can enjoy all-round services of this company D．you may choose the best car from the company