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问题 选择题

分别以下列四组数为一个三角形的边长：（1）6、8、10；（2）5、12、13；（3）8、15、17；（4）4、5、6，其中能构成直角三角形的有（　　）

A．四组

B．三组

C．二组

D．一组

答案

①62+82=100=102，符合勾股定理的逆定理；

②52+122=132，符合勾股定理的逆定理；

③82+152=172，符合勾股定理的逆定理；

④42+52≠62，不符合勾股定理的逆定理．

故选：B．

单项选择题

在每个设备工程合同签订后，应将合同正本由合同管理部门保管，副本交文档管理部门和（）。至此合同签订阶段的工作已经完成。

A.合同管理部门

B.工商行政部门

C.税务管理部门

D.合同执行部门
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阅读理解
阅读理解。

     Last Saturday, our school organized a talent show to raise money for charity. It was a great success.
Students took an active part in it and we raised 20,000 yuan in all.
     After the show I interviewed three students. First, I talked with Liu Li. In the talent show, she danced
the ballet(芭蕾舞). "How long have you been dancing the ballet?" I asked. "For about six years." she
answered. "Why do you learn it?" "I think it's beautiful and I want to be a professional dancer when I
grow up."
    Next I had a talk with Zhao Qiang. He played a piece of Mozart's music. He played wonderfully. I
asked, "When did you start playing the piano?" "Um, I'm twelve now and I have been doing it since I
was five." he said. "Are you going to play the piano after you finish high school?" "Sure. My dream is to
be a pianist."
    Finally, I asked Chen Yun, an 11-year-old girl. She sang us some folk songs(民歌). Her voice is
very sweet. "Why are you interested in folk music?" I asked. "I admire Song Zuying and I want to be
a singer like her. I have been singing folk songs since five years ago. I hope I can hold a singing concert
in the future." she said.
根据短文内容，完成表格。

TalentHow many yearsDream
Liu Li   1. ________  six  2. ________
Zhao Qiang  3. ________4. ________to be a pianist  
Chen YunSinging folk songssincefive years ago 
5.________
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