只有当你把太阳放在中心位置上，天空中其他行星的运动才能说得清楚。 5．He placed a fixed sun at the centre of the solar system with the planets ______________ it…

　　他把太阳固定在太阳系的中心位置上，而行星则围绕着太阳转…… 6．It seemed that the water was __________．

　　看来水是罪魁祸首。

　　did going round 返回目录 Unit 1　Great scientists 基 础 自 主 梳 理 to blame Ⅳ.课文回顾

　　John Snow was a famous doctor in London. In his time

　　cholera was the 1.________ (dead) disease. So John Snow

　　made up his mind to help ordinary people 2.________

　　(expose) to cholera. At that time, no one knew its cause or

　　cure. He knew it would never be controlled 3.________

　　its cause was found. He thought people

　　4.________

　　(absorb) this disease

　　into their bodies with their meals.

　　He tried to prove this. So when another outbreak hit

　　London in 1854, he gathered information and made a map, 5.________ (mark) where all the dead people had

　　deadly 返回目录 exposed Unit 1　Great scientists 基 础 自 主 梳 理 until absorbed marking

　　lived. It was valuable. And finally he concluded that the water was 6.________ (blame). Then John Snow looked 7.________ the source of water. He found all the deaths were linked to the polluted water. So he was able to announce with 8.________ (certain) that the polluted water carried the virus. 9. __________(prevent) this from happening again, John Snow suggested that the source of all the water supplies 10. ___________________ (examine) and new methods of dealing with polluted water be found. Finally “King Cholera” was defeated.

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