A:①②
B:③④
C:②④
D:①③
Dale used to _____to office in his car, but he is used to_____ the bus now.
在最近的30年间,大量粮食从东北输往南方沿海省区.从“南粮北运”到“北粮南运”,中国农业历经千年形成的粮食产销格局被彻底改变了,读图“中国粮食产销格局示意图”, 回答问题。
Helping others is a habit, _________ you can learn even at an early age.