题目

Just 50 years ago Manx seemed to be on the point of disappearing. If you spoke Manx in a pub on the island in the 1960s, it was considered provocative(挑衅的) and you were likely to find yourself in a fight, recalls Brian Stowell, a 76-year-old islander who has written a Manx-language novel, The Vampire Murders, and presents a radio show on Manx Radio spreading the language every Sunday. The language itself is similar to the Gaelic tongues spoken in the island's neighbours, Ireland and Scotland. A century ago, Moghrey mie would have been commonly heard instead of good morning on the 有一人患了流感，每轮传染中平均一个人传染了x个人，则经过两轮传染后，患流感的总人数400，所列方程是（ ）A．1+x+x（1+x）=400B．x+x（1+x）=400C．1+x+x2=400D．1+2x=400