摘要： D 16. B 17.A 18. B 19. B 20. A 21. A 22. D
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一个池塘养了某种鱼5万条，从中捕捞了20条，称得它们的质量如下(单位：kg)：
1.16，1.15，1.21，1.11，1.08，1.36，1.25，1.18，1.14，1.21，1.19，1.14，1.09，1.25，1.22，1.29，1.16，1.23，1.12，1.17．
(1)计算这20条鱼的平均质量；
(2)根据计算结果估计一下池塘中所有这种鱼的总质量．
查看习题详情和答案>>13、下列各等式呈现某种规律，根据规律直接写出第4个等式为
1+2=3；
4+5+6=7+8；
9+10+11+12=13+14+15…
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16+17+18+19+20=21+22+23+24
．1+2=3；
4+5+6=7+8；
9+10+11+12=13+14+15…
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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