摘要：二.填空题11.如图9.在△ABC中.点D.点E分别是边AB.AC的中点.则△ADE与△ABC的周长之比等于 . 图9 图10
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是 下列（ ）方程的接 
（B） 
（C） 
（D） 
二、填空题（2013•江都市二模）若x是不等于1的实数，我们把
称为x的差倒数，如2的差倒数是
=-1；-1的差倒数为
=
，现已知x 1=-
，x2是x1的差倒数，x3是x2的差倒数，x4是x3的差倒数，…，依此类推，则x2013=
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| 1 |
| 1-x |
| 1 |
| 1-2 |
| 1 |
| 1-(-1) |
| 1 |
| 2 |
| 1 |
| 3 |
4
4
．
某校对全校200名初三学生进行数学学习情况的测试，并从中随机抽取了40份试卷，下表是这40份试卷中填空题部分（共14小题，每小题做对得3分、做错得0分）的答题情况：
根据所给信息，填空：
（1）这40份试卷中答对题数的平均数为 ，中位数为 ；
（2）由此可估计全校200名初三学生填空题部分的平均得分约为 分，得分率约为 %，全部做对的约为 人，答对题数的中位数约是 ．
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| 答对题数 | 9 | 10 | 11 | 12 | 13 | 14 |
| 份数 | 1 | 1 | 3 | 8 | 15 | 12 |
（1）这40份试卷中答对题数的平均数为
（2）由此可估计全校200名初三学生填空题部分的平均得分约为
完形填空 （20分）
The famous British inventor George Stephenson was born in 1781 and died in 1848. one of his _21_ important inventions was the train. He _22_his first train when he was forty-four years old. When he was experimenting with the _23_ engine on the train, he met with _24_ from the government, newspapers and the gentlemen in the country. They said that the noise and the smoke would _25_ cows, horses and sheep, that the _26_ would hurtle(炸飞) or that the hot coals from it would _27_their houses. At that time, _28_ people believed what they said.
George Stephenson _29_ the people that the train could go on small _30_, could pull carriages _31_goods and passengers and there was _32_ to them. It was a very _33_ matter for him to _34_ them believe. However, after _35_, he was able to do it; and the first train that _36_ by Stephenson himself _37_ what he had said.
The first day _38_ the people along the way _39_ the noises of the train _40_ and saw it running quickly to them, they ran back home as quickly as they could and closed their doors tightly, for they thought it a genius. They did not dare to come out until it had passed.
【小题2】made B. bought C. introduced D. did
【小题10】 A.reads B. rivers C. steam D rails
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The famous British inventor George Stephenson was born in 1781 and died in 1848. one of his _21_ important inventions was the train. He _22_his first train when he was forty-four years old. When he was experimenting with the _23_ engine on the train, he met with _24_ from the government, newspapers and the gentlemen in the country. They said that the noise and the smoke would _25_ cows, horses and sheep, that the _26_ would hurtle(炸飞) or that the hot coals from it would _27_their houses. At that time, _28_ people believed what they said.
George Stephenson _29_ the people that the train could go on small _30_, could pull carriages _31_goods and passengers and there was _32_ to them. It was a very _33_ matter for him to _34_ them believe. However, after _35_, he was able to do it; and the first train that _36_ by Stephenson himself _37_ what he had said.
The first day _38_ the people along the way _39_ the noises of the train _40_ and saw it running quickly to them, they ran back home as quickly as they could and closed their doors tightly, for they thought it a genius. They did not dare to come out until it had passed.
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