用层次分析法分析下列句子的结构层次，并标明每层的结构关系：这是一种耐酸耐碱的材料。

根据上下文，补全对话，将正确的选项填在横线上，有两项是多余的，一定要认真哟！

A.I want some milk to drink.

B.I would like a chicken sandwiches.

C.My favourite food is chicken sandwiches.

D.Are you hungry?

E.No,thanks.

F.Are you thirsty?

G.What’s noodles?

Tom和Mary去一家饭馆吃饭，以下是Waiter和他们二人的对话。

Tom: 1. ________

Mary: Yes, I'm very hungry.

Tom: Let's eat in the restaurant.

Mary: Sounds good!

Tom: Do you want some noodles?

Mary:  2. _______ I don't like noodles.

Tom: Do you want a chicken sandwich?

Mary: It's good! OK. 3._______

Waiter: Are you ready to order?

Mary: 4. ________What do you want to drink, Tom?

Tom: 5. ________ And I would like a bowl of rice and a plate of meat.

Mary: Let's eat!

你会写这样的句子吗？     

例：丹顶鹤的头顶就像嵌着一颗红宝石。     

1．秋天，枯黄的树叶从半空中落下来，就像                                                      

2．柿子熟了，一只只柿子挂在树上，就像                                                          

3．天上的星星一闪一闪的，就像                                                                   

你了解哪些食品生产经营相关的法律法规？

（2013）在波长为λ的驻波中，两个相邻波腹之间的距离为：（）

A.λ/2

B.λ/4

C.3λ/4

D.λ

高速公路中央分隔带每隔一段距离留有缺口，可供（）在应急情况时使用。

A、高速公路巡逻车

B、经营性客车

C、错过出口的机动车