Today, we continued to review and prepare for test on Friday. Total fertility rate: The average number of children born per woman in a country. Replacement rate: 2.1 children per woman for population to stay constant. We also reviewed how to read population pyramid. If the shape of the pyramid really looks like a pyramid, it means this country's population will grow fast and is hard to stop, just like many African countries. We will identify the population pyramid of different countries, so I have to study hard on it. And Mr. Schick told us we can only use CIA factbook for 10 minutes for first 12 question. I should be familiar with CIA factbook. Finally, I hope I will get a good grade on my test.