According to statistics, the United States welcomes a new life every 7 seconds and enters a new immigrant every 3 1 second. The US Census Bureau released a report at the end of 2007.

Question 1:

According to statistics, the United States welcomes a new life every 7 seconds and enters a new immigrant every 3 1 second. The US Census Bureau released a report at the end of 2007.

Question 1:B

Question 2:C

Question 3: A.

Question 4:C

Question 1: The population growth model of the United States is modern, so it is in the fourth stage in the picture. At this stage, the natural population growth rate is extremely low, so the population aging is serious.

Question 2: The natural population growth rate in the United States is low, but in Figure A, it takes less and less time to increase the population 10 billion, so the population mechanically grows faster (more immigrants). D domestic immigration does not affect the mechanical growth of the American population.

Question 3: Population growth, especially mechanical growth, has filled the gap in the American labor market and promoted economic development, but it has also brought adverse effects such as employment pressure and environmental pressure.

Question 4: The population of China and the United States is aging seriously.