题目内容

① (－7)×(－5)＋(－10)÷2      ②（＋）×12
30   -1解析:
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在直线上取A、B、C三点，使得AB =" 9" cm，BC =" 4" cm，如果O是线段AC的中点，则线段OA的长为         cm
Jiuzhaigou is a very beautiful place. It is in the Aba Tibetan and Qiang Autonomous Region in Sichuan Province. Jiuzhaigou is a valley. It is more than 40 kilometers long. The green and golden trees, the lofty and multi-shaped mountains and the clear and colorful waters form the unique beauty of Jiuzhaogou. The water of Jiuzhaigou is the soul of the beauty. There are more than 100 lakes of different shapes in the valley. These lakes have wonderful colors. They are called “haizi”, which means son of the sea. It is these beautiful lakes that make Jiuzhaigou a fantastic place. Between the forests and the lakes, there are nine Tibetan villages. The name Jiuzhaigou means Nine Village Valley.
Jiuzhaigou was discovered because of a panda rescue program. The pandas were once endangered because the bamboo there was blooming. When people came to rescue the pandas, they were surprised by the beauty of Jiuzhaigou. After that, Jiuzhaigou became a protected scenic area.
In China, there is a saying which goes like this: No mountain is worth seeing after you have seen Mount Huang and no other body of water will attract you after you have visited Jiuzhaigou. The beauty of Jiuzhaigou cannot be described with mere words. The best way to enjoy this fairyland is to go there. See you in Jiuzhaigou.
【小题1】 What is the best title for the passage? （no more than 3 words）
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【小题2】 How long is the Jiuzhaigou Valley? （no more than 7 words）
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【小题3】 How was the Jiuzhaigou Valley discovered? （no more than 9 words）
【小题4】 What does the name Jiuzhaigou mean? （no more than 7 words）
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计算（8分）
⑴                ⑵
⑶              ⑷（π＋1）0－＋－
（12分）
如图①，四边形ABCD是正方形, G是BC上任意一点，DE⊥AG于点E，BF⊥AG于点F.

⑴求证：DE－BF = EF．
⑵当点G为BC边中点时, 试探究线段EF与GF之间的数量关系， 并说明理由．
⑶若点G为CB延长线上一点，其余条件不变．请你在图②中画出图形，写出此时DE、BF、EF之间的数量关系，并说明理由．
德国法学家耶林认为：“罗马曾三次征服了世界，第一次是武力，第二次是宗教，第三次则是以法律。”古代罗马之所以能以法律征服世界，是因为罗马法中流传后世的原则是
A．法律面前人人平等，公正至上B．以眼还眼，以牙还牙
C．礼不下庶人，刑不上大夫D．妇女不得参加任何事务
若a、b互为相反数，c、d互为倒数，则(a＋b)2009＋(c·d)2009=_____________
如果a＝1，b＝－2，c＝3，那么下式中最小的是
A．B．C．D．
下列各式中，最简二次根式是（    ）
A．B．C．D．

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