单项选择题
A．To increase product sales. B．To make a product much better. C．To spend more money. D．To reduce the production.
A．Planes and motorcars have taken the place of trains. B．Oil is expensive today. C．Trains are slow. D．Railways lose money.
A．At midnight. B．In the morning. C．When the car is turned off. D．When the neighbor’s son leaves for work.