下列各组物质中，能相互反应且反应类型属于复分解反应的是（） _爱下问搜题

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问题选择题

下列各组物质中，能相互反应且反应类型属于复分解反应的是（）

A．锌和稀盐酸

B．二氧化碳和水

C．氯化钠溶液和硝酸钾溶液

D．氢氧化钠和稀硫酸

答案

答案：D

题目分析：锌和稀盐酸反应属于置换反应，二氧化碳和水反应属于化合反应，氯化钠溶液和硝酸钾溶液不反应，氢氧化钠和稀硫酸反应属于复分解反应，因此正确的选项是D。

点评：掌握四种基本反应类型的特点以及发生化学反应的条件是解答本题的关键，该题属于初中化学知识。

完形填空

完形填空(共20小题；每小题1.5分，满分30分)
阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
Jame’s New Bicycle
James shook his money box again. Nothing! He carefully   21  the coins that lay on the bed . $24. 52 was all that he had. The bicycle he wanted was at least $90!   22  on earth was he going to get the   23  of the money?
He knew that his friends all had bicycles. It was   24   to hang around with people when you were the only one without wheels. He thought about what he could do. There was no   25  asking his parents, for he knew they had no money to   26 .
There was only one way to get money, and that was to   27 it. He would have to find a job.   28  who would hire him and what could he do? He decided to ask Mr. Clay for advice ,who usually had   29  on most things.
“Well, you can start right here, ”said Mr. Clay. “My windows need cleaning and my car needs washing. ”
That was the   30 of James’ s odd-job（零工） business. For three months he worked every day after finishing his homework. He was amazed by the   31   of jobs that people found for him to do. He took dogs and babies for walks, cleared out cupboards, and mended books. He lost count of the   32   of cars he washed and windows he cleaned, but the 33   increased and he knew that he would soon have   34  for the bicycle he longed for.
The day   35  came when James counted his money and found $94.32. He   36   no time and went down to the shop to pick up the bicycle he wanted. He rode   37   home, looking forward to showing his new bicycle to his friends. It had been hard   38   for the money, but James knew that he valued his bicycle far more   39  he had bought it with his own money. He had   40   what he thought was impossible, and that was worth even than the bicycle.

B．introduction

C．requirement

C．suitability

选择题

筷子是我国和部分国家特有的用餐工具．在正常使用筷子用餐时，筷子属于（　　）

A．费力杠杆，但省距离

B．省力杠杆，且省距离

C．省力杠杆，但费距离

D．等臂杠杆，即不省力也不费力