Choose the correct answer – A,B,C or D – to each question       Mankind is feeling greater pressure from the expanding number of people. The area of the earth can never be expanded. Nor are there endless sources of food and clothing. Yet people are being born faster than they are dying. In the next forty years, the world population may double. How can so many people be fed? What is worse, there is danger that someday mankind will have only standing room.       Birth control should be a basic policy in our country. China has the greatest number of population in the world. With a high birth rate, the production of grains and goods will be unable to meet the need of the people. To raise people’s living standard, we must practise birth control.       There are disadvantages of a family having more children. First, parents cannot give their children a good breeding in food, clothing and shelter, let alone education. Second, child-rearing will exhaust the parents, leaving no time and energy for their work. Last, a family with more children will increase the burden of society. Mankind is feeling greater pressure from........................ A. the supplying of food and clothing B. the expanding number of people. C. the building of remote regions D. the expanding the area of the earth.