为测定某硫酸溶液中溶质的质量分数，化学小组同学取10g该硫酸溶液，向其中加入21.2gBaCl₂溶液，二者恰好完全反应，过滤后称得滤液的质量为28.87g．请计算：

下列各句中加线的词语，使用正确的一项是（     ）

1）Where did you go?

2）What did you do there?

3）What did you see or hear there?

4）Who played with you?

5）Did you have a good time during the summer holiday?

6）How was your summer holiday?

My summer holiday

下列地区黄河流经，山地冰川广布，农业以畜牧业为主的是（　　）