根据短文，回答6~10题Thelongyearsoffoodshortageinthiscountryhavesuddenlygivenwaytoapparentab

根据短文，回答6~10题The long years of food shortage in this country have suddenly given way to apparent abundance．Stores and shoDs are choked with food． Rationing is virtually suspended，and overseas suppliers have been asked to hold back deliveries．Yet，instead of joy，there is widespreaduneasiness and confusion．Why do food prices keep on rising，when there seems to be 80 much more food about？Is the abundance only temporary，or has it come to stay？Does it mean that we need to think less now about producing more food at home？No one knows what to expect． The recent growth of export surpluses on the world food market has certainly been unexpectedly great， partly because a strange sequence of two successful grain harvests in North America is now being followed by a thirdI Mrost of Britain’s overseas suppliers of meat，too，are offering more this year and home production has also raised． But the effect of all this on the food situation in this country has been made worse by simultaneous rise in food Drices，due chiefly to the gradual cutting down of government support for food．The shops are over- stocked with food not only because there is more food available but also because people，frightened by high prices，are buying 1ess of it．Moreover，the rise in domestic prices has come at a time when world prices have begun to fall with the resuit that imported food，with the exception of grain，is often cheaper than the home- Droduced variety． And now grain prices,to0，are falling．Consumers are beginning to ask why they should not be enabled to benefit from this trend．The significance of these developments is not lost on farmers． The older generations have seen it all happen before．Despite the present price and market guarantees,farmers fear they are about to be squeezed between cheap food imports and a shrinking home market．Present production is running at 5 1 percent above pre-war levels，and the government has called for an expansion to 60 percent by 1956；but repeated ministerial advice is carrying little weightand the expansion program is not working very well． The main purpose of the first paragraph is__________． [A]to show the reason of food shortage[B]to explain the conflict between the surplus of food supply and rising prices [C]to show the deteriorating living conditions of farmers[D]to analyze the market demand for food supply