单项选择题
A．double their number every year B．lose a lot of their babies C．move from place to place constantly D．fight and kill a lot of themselves
A．their size B．their appearance C．the way they rest D．the kind of food they eat
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