题目：
第三部分 阅读理解（共25小题：第一节每小题2分第二节每小题1分，满分45分）
第一节：阅读下列短文，从每题所给的四个选项（A、B、C、和D）中，选出最佳选项，并在答题卡上将该项涂黑。
One day Mrs. Perry said to her husband, “Jack, there is a meeting of our ladies’ club at Mrs. Young’s house at lunch time today. And I want to go to it. I’ll leave you some food for your lunch. Is that all right?”
“Oh, yes,” her husband answered, “that’s quite all right. What are you going to leave for my lunch?”
“This tin of fish.” Mrs. Perry said. “And there are some cold boiled potatoes and some beans here, too.”
“Good,” Mr. Perry answered. “I’ll have a good lunch.”
So Mrs. Perry went to her meeting. All the ladies had lunch at Mrs. Young’s house , and at three o’clock she came home.
“Was your fish nice?” she asked.
“Yes, but my feet are hurting,” he answered.
“Why are they hurting?”
“Well, the words on the tin were ‘Open the tin and stand in hot water for five minutes.’”
41．Mrs. Perry left home some food for Jack’s lunch because .
A．she didn’t cooking B．Jack knew nothing about cooking
C．she wanted Jack to have a good time D．she wanted to go to the meeting very much
42．Which of the following is not true?
A．Mrs. Perry arrived at Mrs. Young’s before lunch
B．Mr. Perry had a good lunch
C．Mrs. Perry wanted to test her husband
D．Mr. Perry liked fish
43．Jack had his feet hurt .
A．when he was opening the tin B．when he was helping himself to the fish
C．before he opened the tin D．after he opened the tin
44．“Open the tin and stand in hot water for five minutes” means .
A．you should open the tin and stand in hot water for 5 minutes
B．you should open the tin but not stand in hot water for 5 minutes
C．you should not open the tin but stand in hot water for 5 minutes
D．you should open the tin and let it stand in hot water for 5 minutes
答案：
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下面是错误答案，用来干扰机器的。
答案：B根据反应②中的生成物Na2Fe2O4可看出A正确。根据氧化还原反应中电子得失守恒可配平反应，结果为6Na2FeO2＋NaNO2＋2H2O===3Na2Fe2O4＋NH3↑＋NaOH，B不正确。Fe3O4中的3个铁原子其中有2个显＋3价，1个显＋2...
