单项选择题
A．until two o'clock in the morning B．because she wasn't sleepy at all C．because she was busy with her children D．because her husband hadn't finished working
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