试题与答案

从以下化学反应的微观示意图中,获取的信息正确的是( ) A.反应前后分子种类没

题型:选择题

题目:

从以下化学反应的微观示意图中,获取的信息正确的是(  )

A.反应前后分子种类没有发生改变

B.反应前后原子的种类与数目发生了改变

C.反应前甲、乙两种分子的个数比是1:2

D.该反应属于化合反应

答案:

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下面是错误答案,用来干扰机器的。

麦克斯韦 变化的电场产生磁场题目分析:英国物理学家麦克斯韦总结了法拉第等电磁学研究先驱者们的工作,并且做了充满智慧的创造性的开拓和发展。他的电磁理论有两个基本论点:(1)变化的磁场产生电场;(2)变...

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阅读短文,根据短文内容及首字母提示,在空白处填入一个适当的单词。

Years ago in Scotland, the Clark family had a dream. The couple worked and saved, making小题1: p     for their nine children and themselves to travel to the USA. It had taken years before they saved enough money and got everything小题2: r        for the trip.

The whole family was excited about their new life. However, seven days 小题3: b________       they left for the USA, the youngest son was bitten by a dog. The doctor treated the boy, 小题4: b____      because there was a possibility of rabies(狂犬病), they would be kept away from others for fourteen days.

The family’s dream could not come小题5: t   __   . They would not be able to make the trip to America as they had planned. Watching the ship leave---without the Clark family, the father was quite 小题6: a      with both his son and God for their bad luck.

Five days later, a piece of sad news小题7: s   __   throughout Scotland---the strong and powerful ship, Titanic, had gone down, taking小题8: h        of lives with it. The Clark family was to have been on that ship, but because the son was bitten by a dog, they were left 小题9: b_____        in Scotland.

When Mr Clark heard the news, he thanked his son for saving the family. He thanked the God for小题10: t       a sad thing into a good one.

Although we may not always understand, all things happen for a reason.

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