73. By "the buzzing of a fly" (Para. 1), the author means"________” (A). the noise of an insect (B). a low whispering sound (C). meaningless talks (D). the voice of a chatterbox

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