问答题A．They can get a guidebook in Montreal.B．It might not be necessary to buy a guidebook.C．He doesn’t mind the cost of a guidebook.D．It’s no use trying to study on a trip,

问答题A．The battery is not correctly positioned.B．She doesn’t know how the calculator works.C．The calculator needs a new battery.D．The man should enter the numbers in a different order.