读短文，选择正确答案。

      My name is Betty. I live in China. I study in Shanghai No. 6 Primary School. My birthday is coming. It's in

August. On my birthday I often get up at 7: 30. I buy a lot of food with my mother in the supermarket. Usually,

I have a good time on my birthday.

      In the evening, I eat dinner at 6: 00. Then I have a birthday party. At the party, we play games and eat a big

birthday cake. I eat ice cream, too. It's my favourite.

1. When is Betty's birthday?[ ]

A. In fall.

B. In winter.

2. A supermarket is a _____________.[ ]

A. store

B. playground

3. Is Betty happy on her birthday?[ ]

A. Yes, she is.

B. No, she isn't.

4. Does Betty like to eat ice cream?[ ]

A. Yes, she does.

B. No, she doesn't.

5. What do they do in her party?[ ]

A. They watch TV.

B. They play games.

为进行末梢饮用水的细菌学检验而采集水样时，在盛装饮用水水样的容器中预加入硫代硫酸钠的目的是

A．调整pH值

B．调整硬度

C．消除余氯

D．消除异味

E．调整水中溶解性固体