题目列表(包括答案和解析)

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7. _______ her stamps _______ groups in her spare time is her great pleasure. 

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6. Our great achievements _______ what we did in the past and do today. 

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5. It is said that the invention of his will ______ the people living in this area.  

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4. He _______ the tourists and took them back to the coach. 

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3. Our school ______ two main parts, the senior part and the junior one. 

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2. Nothing can ______ from what you have today now. 

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    用所给词或短语的适当形式填空。 

be made up of take away benefit round up depend on classify...into... promote born make an attempt be based on

1. The price______ the quality. 

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26.小明将一张矩形纸片沿对角线剪开,得到两张全等直角三角形纸片(如图2),量得他们的斜边长为10cm,较小锐角为30°,再将这两张三角纸片摆成如图3的形状,使点B、F、D在同一条直线上,F为公共直角顶点。然后小明又将图(3)中的△ABF沿直线AF翻折到图(4)的位置,点B落在FD边上的B1点,AB1交DE于点H。

请你说明:(1)AH=DH.;(2)点H在∠AFD的角平分线上。

   

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25.如图,在△ABC中, D、E分别是AC、AB上的点, BD与CE交于点O. 给出下列三个条件:①∠EBO=∠DCO;②∠BEO=∠CDO;③BE=CD.

  (1)上述三个条件中, 哪两个条件可判定△ABC是等腰三角形(用序号写出所有情形);

  (2)选择第⑴小题中的一种情形, 证明△ABC是等腰三角形.

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24.如图,在中,上一点,于点有什么位置关系?证明你的结论.

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