72 . According to the author, people make conversation to ______ (A). exchange ideas (B). prove their value (C). achieve success in life (D). overcome their fear of silence

70. By comparing tomatoes raised in Britain and in Ghana, the author tries to explain that ______ (A). British tomatoes are healthier than Ghanaian ones (B). Ghanaian tomatoes taste better than British ones (C). cutting down food miles may not necessarily save fuel (D). protecting the environment may cost a lot of money