A:奴隶贸易
B:英国的圈地运动
C:北美的种植园经济
D:西班牙对拉丁美洲的掠夺与经营
下列各句,标点符号使用正确的一项是( )
计算:|﹣22|=____ .
E____ with new scientific farming methods, they have been able to use less farmland than in the past.