下列有关动物运动的叙述，错误的是（ ） A．关节软骨可增加关节的牢固性 B．骨骼

加碘食盐、高钙牛奶中的“碘”和“钙”是指（　　）

A．单质

B．分子

C．元素

D．原子

根据句意及首字母提示补全单词。

1. I have a piano l_____ on Wednesday afternoon.

2. Thank you for your i _____ to visit your school.

3. He spent the w_____ afternoon watching TV.

4. S _____ is the fist day of a week.

5. I have to b _____ my younger sister when my parents are away.

6. The students are studying for the English t _____.

7. Something is wrong with my teeth, so I have to go to see the d _____.

8. Where are you going the day after t _____?

9. Hi, can you play tennis w _____ me?

10. Maybe you can come a _____ time.

不属于利用抗生素治疗细菌性疾病不彻底弊端的一项是：

A．病菌并未死亡仍会繁衍后代

B．疾病会慢性迁延

C．疾病会反复发作

D．导致临床上病原不明

组织设计确定各部门的职能，应使( )的领导、检查、指挥灵活，达到指令传递快、信息反馈及时。

A．横向
B．管理人员
C．纵向
D．管理部门

氧化铽