设x，y和z都是int型变量，且x=3，y=4，z=5，则下面表达式中，值为0的表达

选用恰当的代词填空。    

1. _____ have a ruler. But _____ ruler is short. Can you give _____ a long ruler? (I, me, my)

2. _____ are a good boy. What's _____ name? (you, your)

3. _____ is a teacher. _____ name is Wang Li. (she, her)

4. David is an American boy. _____ is twelve. _____ English is not good. Please help _____ .

    (he, him, his)

5. This is _____ school. _____ study English here. Do you want to join _____ ? (we, us, our)

6. Look at _____ ! _____ are from England. _____ names are Lucy and Lily. (they, them, their )

7. _____ have a good friend. _____ name is Tom. _____ parents work in China. _____ are teachers.

    Look, this is _____ photo. How happy _____ are!

8. Thank _____ for helping _____ , Dale. I can do _____ homework now. Let _____ go to a movie.

    _____ think _____ is a funny movie.

骨盆有哪两对重要的韧带?判断中骨盆是否狭窄的重要指标是什么?

进行煤气危险作业应注意哪些事项？

物流网络规划的时间性是指为满足客户服务目标而保持产品可得性的问题。

客运出租汽车行业的管理和发展坚持（）的原则。

A、统筹规划、统一管理

B、总量调控、合法经营

C、公平竞争、方便群众

D、加强管理、服务社会