单选题

　　[概括大意]The Second World War is perhaps the most catastrophic （灾难性的） event that mankind has ever suffered. The war affected 80 per cent of the world‘s people at that time， from 61 countries， and claimed 55 million lives.

　　The main idea of this paragraph is__________.

　　A.Gloomy World

　　B.World‘s Worst Disaster

　　C.The Origin of The Second World War

　　D.The Time of The Second World War