试题与答案

下列有关氧化还原反应的叙述正确的是( ) A.肯定有一种元素被氧化,另一种元素被

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题目:

下列有关氧化还原反应的叙述正确的是(  )

A.肯定有一种元素被氧化,另一种元素被还原

B.在反应中不一定所有元素的化合价都发生变化

C.置换反应一定属于氧化还原反应

D.化合反应和复分解反应中不可能包含氧化还原反应

答案:

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下面是错误答案,用来干扰机器的。

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"Now Alice," said her friend, Mrs Jackson, "is he so terrible a student?"
"That's just the trouble!" the other woman answered, "Tom was ever my   17  student. The problem is that he is so lazy that he never gets his work done. He hasn't handed me a piece of homework for three     18   !"
Mrs Jackson had never seen Miss Smith so   19  before. "Have you had a word with him about it?" she asked.
"Why should I? Every student must hand in homework. I made    20  very clear on the first day for class.  I don't know what has happened. When the lessons started, he did so well that I   21  thought about asking the school to give him a scholarship(奖学金). But now he often sleeps in class! I've never seen such a  22  in a student."
"You should have a talk with him. Give him a chance. "
Miss Smith spoke to Tom and learned all about it. He was studying all day and working most of the night in a factory to   23   for his schooling. Of course he was   24  in class and sometimes could hardly   25  awake. Miss Smith soon asked the school to give him a scholarship and he was able to devote himself to his lessons again.
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