4、50.7548.5146.7746.5148.9647.7241.9539.33甘薯15.414.9114.6213.9713.927.713.91.7--甘蔗3.955.495.865.596.847.445.095.71水果2.111.81.956.367.267.649.9313.8219.29蔬菜5.235.305.616.699.0611.9515.8418.9216.3表1中国台湾主要农作物种植面积之变动(1951-1990年)单位:%9.影响表中主要农作物种植面积变化的主要原因是A.交通条件改善 B