据报道：近几年有许多重大火灾都是因线路连接处接触不良所造成的_爱下问搜题

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问题填空题

据报道：近几年有许多重大火灾都是因线路连接处接触不良所造成的，教训十分深刻．线路连接处接触不良引起火灾的原因是：当线路连接处接触不良时，该处的电阻将_________ （选填“减小”“增大”或“不变”），在该接触处就会产生局部过热升温，接触处的电阻又将随着温度的升高而_______（选填“减小”“增大”或“不变”），……从而形成电热的逐步积累和恶性循环，以致引发火灾．

答案

增大；增大

完形填空

Anna lived on the side of a valley. One summer, there was a very big     , and a lot of houses down below Anna’s were washed away. Anna’s house was     enough to escape the flood, so when the water had           and the other houses were       there with no roof and no walls and all covered with mud(泥), her house was just all right.
Her house was quite small, her husband was dead, and she had four children,      Anna took in one of the families that had lost     in the flood and she     her home with them until it was     for them to rebuild their house.
　　Anna’s friends were     when they saw Anna do this. They could not understand why Anna wanted to give     so much more work and trouble when she already had quite a few children to     .
“Well,” Anna       her friends, “at the end of the First World War, a woman in the town where I then lived found herself very       , because her husband had been killed in the       and she had a lot of children,      I have now. The day before Christmas, this woman said to her children, ‘We won’t be able to have much for Christmas this year, so I’m going to     only one present to all of us. Now I’ll go and get it.’ She came back with a        who was even poorer than they, and who had no parents. ‘Here’s our       ,’ she said to her children.
　　 The children were     and happy to get such a present. They     the little girl, and she grew up as their sister. And I was that Christmas present.”

D．disappeared

B．disappointed

A．explained to

C．talked with

单项选择题

下列能清热安胎的药物为（）

A．砂仁

B．苎麻根

C．黄连

D．紫苏

E．艾叶