情景交际。

1. 当你想把自己的朋友Rose介绍给别人时，应说：[ ]

A. She is my friend.    

B. This is Rose.

C. It's Rose.

2. 当你想表达Danny在Kim的后面时，应说：[ ]

A. Danny is behind Kim.    

B. Kim is behind Danny.

C. Danny is beside Kim.

3. 你想问对方自己的书在哪儿，应说：[ ]

A. Where is my book?  

B. Where are my book?

C. What is my book?

4. 当你想问对方这是不是他的铅笔时，应说：

A. Is this your pen?    

B. Is this your pencil?

C. Are this your pencil?

5. 你想问对方叫什么名字，应说：[ ]

A. What are your name?    

B. What's vou name?

C. What's your name?

检测混凝土碳化深度，按批量检测的构件，混凝土强度平均值小于C25，标准偏差大于( )MPa时应按单个构件评定。

A．2.5

B．3.0

C．4.5

D．5.5