... world In A.D .1, In 17 5 0, In 18 50, In 19 50, In 2000, - Calls on some Sts to answer in front of the class - Checks and corrects as the whole class Expected answers: In 10 .000 B.C, ... cấp - population growth: phát triển - limit (n;v): giới hạn, hạn chế - safe (adj): an toàn - birth-control methods: phơng pháp sinh đẻ có kế hoạch - available (adj): có sẵn để dung, có giá trị - ... about 10 million people in the world In A.D .1, the world's population was 300 million In 17 5 0, there were 625 million people In 18 50, the population reached the figure of 1, 300 million In 19 50,...