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问题 选择题

（10滨州10）．如右图所示，试管中盛有某种液体，将气球中的某种固体小心的倒入试管中，不能观察到气球变大的一组物质是

A．氯化钠和水

B．铁粉和稀硫酸

C．生石灰和水

D．二氧化锰和过氧化氢溶液

答案

答案：A

A、氯化钠溶于水后，温度没有明显变化，气球没有明显变化；

B、铁和稀硫酸反应能生成氢气，会使气球膨胀起来；

C、生石灰溶于水能够放出大量的热，会使气球膨胀起来；

D、二氧化锰和过氧化氢溶液混合能生成大量的氧气，会使气球膨胀起来．

故选A．

单项选择题

When I was looking for a Christmas present for my daughter in a toy store, a nicely dressed little girl, with some money in her little hand, was looking at some beautiful dolls. When she saw a doll she liked, she would ask her father if she had enough money. He usually said yes.
At the same time, a boy, with old and small clothes, was looking at some video games. He, too, had money in his hand, but it looked no more than five dollars. Each time he picked up one of the video games and looked at his father, he shook his head.
The little girl had chosen her doll, a very beautiful one. However, she noticed the boy and his father. She saw the boy give up a video game with disappointment and walk to another corner of the store.
The little girl put her doll back to the shelf and ran over to the video game. After she talked to her father, she paid for the video game and whispered(耳语) to the shop assistant.
So the boy got the video game that he wanted for free—he was told it was a prize from the store. He smiled happily, although he felt it was so incredible. The girl saw all this happen. She smiled, too.
When I walked out of the store to my car, I heard the father ask his daughter why she had done that. I would never forget their short talk. " Daddy, didn’t Grandma want me to buy something that would make me happy"
He said, "Of course, she did. "
"Well, I just did!" With that, the little girl started skipping towards their car happily.

The boy ______.

A．wore new and nice clothes
B．had much money in his hand
C．was from a poor family

D．wanted to get a doll very much
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单项选择题

河流的集水区域称为（）。

A.区域

B.集水面积

C.流域

D.水文分区
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