切取一段紫背天葵的茎，插入湿润的沙土中。一般在4—10天后，即可生出新根，这种繁殖方法叫（   ）

将颗粒完整饱满的种子分成甲、乙两组，在相同的适宜温度下播种，甲组种在肥沃湿润的土壤中，乙组种在贫瘠湿润的土壤中，这两组种子的发芽状况是（　　）

56÷7×8____64

下列四个地区，树木年轮最不明显的是（   ）

Sarah: We're going on a trip. What do you want to wear?

Mike: I want to wear my pants and sweater. What about you? 

Sarah: I want to wear my skirt and dress. And I need a hat.

Mike: Oh! It looks nice. I can take my shirt and shoes.

Sarah: I will take my jacket, too.           

例如：Whose skirt is it?  It's Sarah's skirt.

根据划线单词提问。