单项选择题
A．exposing children to the new environment B．using modern facilities and equipment C．combining language lessons with games D．giving children confidence
A．The bikes were more expensive than it is today. B．People’s salary was very low. C．Most people could afford a bike. D．People lived in courtyard houses with very good equipment.
A．the phenomenon of birds dozing in pairs is widespread B．birds prefer to sleep in pairs for the sake of security C．even an imagined companion gives the bird a sense of security D．a single pet bird enjoys seeing its own reflection in the mirror