单项选择题
A. Too expensive. B. Hard to drive. C. Easy to control. D. More than just a charge.
A. people generally trust a person in uniform B. people enjoy wearing comfortable uniform C. the cost of the uniform is acceptable to people D. people wear uniforms to show their professions
A. a useless advertisement B. how to make an effective advertisement C. how the man lost and found his umbrella D. what the merchant did for the umbrella owner