问题 单项选择题

空气中CO2气渗透到混凝土内,与其()起化学反应后生成碳酸盐和水,使混凝土碱度降低的过程称为混凝土碳化,又称为中性化。

A、酸性物质

B、碱性物质

C、中性物质

D、氮气

答案

参考答案:B

阅读理解

阅读理解。

     It's Charlie's birthday today, but he isn't feeling happy. No one wishes him a happy birthday. Mother

says nothing about his birthday. She just tells Charlie to play outside. At lunch time, his mother calls,

"Come in for lunch, Charlie!" Charlie slowly walks into his house. But the living room looks different.

Charlie sees a big "Happy Birthday" banner (横幅). Then, he sees a birthday cake, balloons, presents,

and all of his friends. "Happy birthday!" everyone shouts. Charlie's face lights up. He is happy and

surprised (吃惊). No one forgets his birthday after all!

1. What is this story about?

A. Eating cake.                    

B. Celebrating a special day.

C. Forgetting a birthday.            

D. Having fun at a friend's party

2.Why is Charlie not happy?

A. He doesn't like his party.        

B. He doesn't like his presents.

C. He wants to eat cake.            

D. He thinks people forgets his birthday.

3. Why does the living room look different?

A. There are many decorations (装饰).

B. The lights are on.

C. There is a birthday cake.        

D. There are many presents.

4. What does the underlined (划线的) word "light up" properly mean (意思是) here?

A. 点燃        

B. 容光焕发     

C. 抬起来       

D. 照亮

5. Which of the following (下面的) is not right?

A. There are many lovely things in the living room.

B. Charlie's mother plays a trick on Charlie.

C. Charlie is happy all day.    

D. No one forgets Charlie's birthday.

单项选择题