题目

阅读理解Life will probably be verydifferent in 2050. First of all, it seems that TV channels will have vanished by 2050. Instead, people will choose aprogramme from a menu and a computer will send the programme directlyto the television. By 2050, music, films, programmes, newspapers and books willcome to us in the similar way. In many places, agricultureis developing quickly and people are growing fruit and vegetables for export. Thisuses a lot of water. Therefore, there could be serious shortages of water. Somescientists predict that water could be the cause of wars if we don't act now. I“三川北掳乱如麻，四海南渡似永嘉”李白的诗句中提到了永嘉五年，西晋都城被攻陷，中原人民大量南迁江南的情景。从中可以看出，北方人民南迁的主要原因是（ ）A.北方自然条件恶劣B.南方经济发达C.南方自然条件优越D.北方战乱，南方相对安定