什么是人口质量？
参考答案：
人口质量也称人口素质，即人口总体的各种特质。通常指人认识社会和改造社会的能力和条件。
---Doesn’t your father often go to work by bus ?
---____________. But ____________ he goes to work on foot.
A．No, he doesn’t . sometime
B．Yes , he does . sometimes
C．Yes, he does. some time
D．No, he doesn’t. sometimes
