A：①③
B：②③
C：①④
D：③④
根据短文内容，选择正确答案。 It’s Sunday morning．There are many people in the park，some boys are playing basketball．There are some girls under a big tree．They’re singing and dancing．What are those women doing? They are drinking tea．Look at the woman in a blue coat．Who's she? She’s my mother．She is talking to Lin Feng．Lin Feng is her student．He is a good student．He studies hard．He’s good at all the subjects． And he's friendly to all his teachers and his friends．
明代农民被越来越深地卷入市场网络之中。种植较广的经济作物，首推棉花和桑树，江南和华北都形成了大面积植棉区，蚕桑业则集中在长江三角洲地区。福建、广东等地则利用温暖湿润的气候条件，广泛种植甘蔗、荔枝、龙眼等经济作物。材料说明（ ）
