填空题
What is the main task of the United Nations Population Fund?
填空题
How many people are there in the world today?
填空题
What's the percentage of the population growth of the 49 least developed countries in 50 years?
填空题
Who will do more harm to the environment, the developing countries or the developed countries?
填空题
Who should be given more power in older to have slower population growth?