物业管理公司应积极参加( )的活动，接受其业务指导。
A．房地产行政主管部门
B．物业管理协会
C．物业管理行业协会
D．工商、税务、公安部门
参考答案：C
根据下表判断，下列说法正确的是
A.铝的相对原子质量是13
B.钠离子核外有三个电子层
C.第二、三周期元素的原子从左至右最外层电子数逐渐增多
D.在化学变化中镁元素容易失去最外层2个电子形成镁离子
单词拼写。
1. Richey was glad to have a chance to ______ (采访) a few foreigners who attended "Join the Fun
in Jinling" yesterday.
2. We can enjoy f______ air in the countryside.
3. We feel quite ______ /ri'lkst / when having a music class.
4. The astronauts ______ (描述) what they had seen in space.
5. The abacus was invented in the sixth ______ /senturi/ by the Chinese.
6. He r______ to go to the party so I had to go there instead.
7. It was cold,but the trip was ______. (令人愉快)
8. We hope it will be sunny tomorrow, for our ______ /'piknik/.
kst / when having a music class. 
uri/ by the Chinese.