问题 选择题

常温下,用0.100 0 mol/L NaOH溶液滴定20.00 mL 0.1000 mol/L HCl溶液,滴定曲线如图所示。下列说法不正确的是

[ ]

A.a=20.00

B.滴定过程中,可能存在:c(Cl-)>c(H+)>c(Na+)>c(OH-)

C.若用酚酞作指示剂,当滴定到溶液明显由无色变为红色时停止滴定

D.若将盐酸换成同浓度的醋酸,则滴定到pH=7时,a>20. 00

答案

CD

阅读理解

阅读理解。

     "Throw me the ball!"

     "Here! Throw it to me!"

     The boys are playing basketball. They play games every Tuesday and Thursday afternoon. There is a

 big field (场地) in the school. They play other games, too.

      Now, it's 5:30. Fred and Tom are walking home together. "My brother is going to give me his

 basketball shoes," says Tom. "My father is going to buy him new shoes."

     "Oh, that's fine. what size (尺寸) are they?"

     "Size seven. That's my size. They are too small for my brother."

     "when is he going to give them to you?"

     "When he gets his new shoes next month, I think.  Come over after supper and see them."

     "OK, see you! "

1. When do the boys play games?

    A. Every day.

    B. Every Thursday only.

    C. Every Tuesday only.

    D. Every Tuesday and Thursday.

2. What time do they leave school?

    A. At five o'clock.          

    B. At six o'clock.

    C. At five thirty.            

    D. At seven

3. Which is right?

    A. Tom walks home alone every day.

    B. Tom walks home with all his classmates.

    C. Tome walks home with a girl.

    D. Tom walks home with Fred.

4. When is Tom going to get the shoes?

    A. In two months.          

    B. Next month.

    C. Next week.              

    D. Next day.

5. Why does Tom's brother give Tom his shoes?

    A. They are too big.        

    B. They are too small.

    C. They are too beautiful  

    D. They are too old.

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