单项选择题
A．their size B．their appearance C．the way they rest D．the kind of food they eat
A．to occupy the best resting places B．only when it is dark C．to protect their homes from outsiders D．when there is not enough food
A．They only care for their own babies. B．They share the feeding of their young. C．They help when a baby bat is in danger. D．They often leave home and forget their youn