介绍:
A: Honey, guess what? Just now two guys came to our house and asked me some strange questions
B: What questions?
A: They first asked me how many people there are in our family, and how old we are, where our birth places were and when we were born and so on. Then they gave me some questionnaires to fill.
B: Oh, I see. They were doing population census. The people were census enumerators. And you were being a respondent.
A: Really? Why?
B: I don't know what it's like in Africa, but in China, we have done the census for 5 times since 1953. This is the sixth time. You know, it's to provide statistics for our government.
A: But how?
B: They make sampling survey of the families in China. Then they get to know the birth rate, mortality rate, sex ratio. From those numbers they can calculate the natural growth of population. And they can also see if our country is going through aging of population or rejuvenation of population
A: Wow! What a tiring job.
B: Yes. So we have to cooperate.
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