山东省又称齐鲁大地，起源于西周的 [ ]
A．郡县制
B．分封制
C．禅让制
D．世袭制
答案：B
“地球生命的保护伞”在地球大气层的平流层。
根据提示写单词。
1. My mother often ___________ the clothes for us. (折叠)
2. I don't like to ___________. (洗餐具)
3. Do you ___________ yourself every day? (铺床)
4. Please take out the ___________. (垃圾)
5. I ___________ with you. (不同意)
