e.g. Who do you know is on duty today? 你知道今天谁值日吗?这里do you know是插入语,who在句中作主语。 A:What a large population ! The world … 7.2 billion. … 90 million every year. B:Which country …? A:China … reach…, and India …with …. B:… the USA? A:321 million. B:It shows … developing countries … developed countries. A:…is growing faster … B:So it is. The population problem … developing countries A:China … carry out … control the population. Act out the dialog Drills 3 Work in groups and discuss the population of the world. The following chart and questions may help you. 1. Which of these 5 countries has the largest/smallest population? What’s the population of it? 2. What can you tell from the population in developing countries and in developed countries? 3. What problems does the large population cause? 4. What measures do you think should be taken to solve the population problem? China has the largest population. The population of China is 1.37 billion. Canada has the smallest population. The population