【正确答案】 B

【答案解析】[听力原文]
Relief workers in central Vietnam are racing against the clock to rush food to areas cut off by floods. Large areas of the affected region are still covered in water following the country's worst flood in four decades. Officials say at least 500 people have been killed and 90 are missing. Economic damage has been put at US＄50 million. Homes and farms have been badly damaged and rebuilding work is under way but officials warned that relief efforts must be stepped up to reach hundreds of thousands of villages ruined in isolated areas without food.

细节题 文中提到…the country's worst flood in four decades. 可知B为正确选项。

【正确答案】 A

【答案解析】细节题 文中提到Economic damage has been put at US＄50 million. 可知A为正确选项。