单项选择题
A、 He enjoyed using his new camera. B、 He left his camera at the airport. C、 He left his camera in his friend’s car. D、 He lost his camera on his trip.
A、 the problems of insomnia B、 types of fatigue C、 the dangers of fatigue D、 people’s need for rest
A、 They are forced to retire at an earlier age. B、 They have to cope with reduced pensions. C、 Their spending power has increased to record high. D、 Their confidence has dropped to the lowest level.