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问题 选择题

下列化学反应中，属于氧化还原反应的是[ ]

A．Na2CO3＋CaCl2===CaCO3↓＋2NaCl

B．Fe+CuSO4===Cu+FeSO4

C．2NaHCO3Na2CO3+CO2↑+H2O

D．CaO＋H2O===Ca(OH)2

答案

答案：B

题目分析：

选项A，反应前后元素的化合价不变，不是氧化还原反应；

选项B，铁、铜元素化合价变化，是氧化还原反应；

选项C，反应前后元素的化合价不变，不是氧化还原反应；

选项D，反应前后元素的化合价不变，不是氧化还原反应。

故选：B

单项选择题

Once a man and his wife worked for an old man. There was a big box in the old man’s living room. The old man pointed to the box and said, "There’s only one thing you (1) do. Don’t open the box. " (2) saying this, he left his home.The woman said to her husband," There must be (3) expensive in the box. Let’s open it, shall we" Her husband said (4) to her. But the woman didn’t give up her (5) . One day, she decided to find out (6) was in it. Her husband didn’t stop her. She opened the box and looked inside. To her surprise, she found nothing in the box. She tried hard to close it, but she (7) That evening the old man came home and found the box was (8) . He was very (9) and asked the woman and her husband to leave his home."But there was nothing in the box," the woman said. "We haven’t taken anything at all. "The old man (10) them, "The box is not important, but I cannot believe you. That’s important!

 

第（3）空应选择（）

A．nothing

B．everything

C．something

D．anything
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单项选择题

一般处方保存期限是

A．半年
B．五年
C．三年
D．一年
E．一年
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