急求英语作文,age in china AND IN USA要求：1.the situation of old people in china2.old people in the usa 3.a conclusion
问题描述：
急求英语作文,age in china AND IN USA
要求：1.the situation of old people in china
2.old people in the usa
3.a conclusion
答
The main cause of the aging problem in China is due to the improvement of medical condition,social culture and scientific technology so both the birth rate and mortality rate of China keep decreasing ...