对短期边际成本与平均成本、平均变动成本之间关系的叙述，正确的是（）。 A.短期边际成

男性，45岁，右胫骨开放骨折不愈合2年，伤口处有窦道形成，半年前有死骨排出，X线示骨密度增高，无骨折线，终未有新骨生成，最适宜的手术方法是（）。

A.截肢术

B.病骨整段切除

C.肌瓣填塞术

D.骨水泥填塞术

E.蝶形手术

“细胞→组织→器官→系统→生物体”是哪类生物身体结构的描述（　　）

A．海洋中生活的各种藻类和鱼的结构层次

B．森林中所有的植物的结构层次

C．生物圈中所有的微生物的结构层次

D．人和动物体的结构层次

句型转换

1. I watched TV after I finished my homework.(改为同义句)

    I __________ __________ TV __________ I finished my homework.

2. The teacher said," Don't talk in class."(变间接引语)

    The teacher __________ __________ __________ __________ in class.

3. I didn't know how I could get to the railway station.(改为同义句)

    I didn't know __________ __________ __________ to the railway station.

4. My brother was playing computer games when I came in.(对画线部分提问)

    __________ __________ __________ brother __________ when you came in?

5. He usually does his homework in the evening.(用from 6 to 7 yesterday evening改写)

    He __________ __________ his homework from 6 to 7 yesterday evening.

6. It will be cloudy tomorrow.(对画线部分提问)

    __________ __________ the weather __________ tomorrow?

7. Lily is as old as Lucy.(改为同义句)

    Lily is __________ __________ age __________ Lucy.

8. I think Sam will be teacher in ten years.(对画线部分提问)

    __________ do you __________ Sam will be in ten years?

9. Tom should give me some advice.(对画线部分提问)

    __________ __________ Tom __________?

10. She said, "Are you doing your homework?"(改为间接引语)

     She__________ __________ __________ __________ doing __________ homework.

办公室打印资料草稿时尽量用（）。

A.白纸 

B.复印纸 

C.已打印过一面的废纸

证券监督管理机构将根据股权分置改革进程和市场整体情况择机实行“新老划断”，即对首次公开发行公司不再区分流通股和非流通股。 ( )