Why do people think there is imbalance between men and women in the United States?
【正确答案】：There were over 158.6 million females in the United States in 2009. The number of males was 151.4 million. At age 85 and older, there were more than twice as many women as men.
【题目解析】：参加教材P185。
掌握“The American Population”知识点。
