单项选择题
A. Different kinds of books about dogs. B. Different breeds of dogs. C. Responsibility for seeing that dogs are properly cared for. D. The care and proper selection of dogs for family pets.
A. Over three million people live on coffee farming. B. It is controlled by four or five big companies. C. It is next only to oil in terms of economic importance. D. Coffee growers usually own four or five hectares of land.