【正确答案】 C

【答案解析】[听力原文]
   A UN agency says there are major funding gaps in efforts to help the agricultural sector adapt to climate change. The Food and Agriculture Organization, the FAO, says this could affect food security. The warning comes as the UN Climate Change Conference continues in Cancun, Mexico.
   The World Bank estimates it will cost about $2.5 billion a year—for the next 40 years—to help agriculture in developing countries adapt to climate change. Other estimates say costs could run as high as $14 billion a year.
   However, the FAO says, "available financing mechanisms are substantially insufficient to meet the climate change and food security challenges faced by the agricultural sector." This, despite the fact that the FAO says there are many examples of how agriculture can become more.
   According to the World Bank, how much does it cost to tackle agricultural challenges yearly?