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Rivers are one of our most important naturalresources(资源). Many of the world’s great cities are located on rivers, and almost every country has at l______one river running through it that plays an important part in the lives of its people.

Since the beginning of history, people have used rivers for transportation. The longest one in the United States is the Mississippi. The lifeline of Egypt is the Nile. To the people of India, the Ganges is great, but it is also important for transportation; ships cant______along it for a thousand miles. Other great rivers are the Congo in Africa and the Mekong in southeastern Asia. The greatest of all fornavigation(航海), however, is the Amazon in Brazil(巴西). It is so wide and so deep that large ships can go about two thousand miles up it.

B_______transportation, rivers give food to eat, water to drink, water for crops, and chances for fun. In order to increase thesupply(供给) of water for crops, engineers sometimes build adam(大坝) a________a river and let a lake form behind the dam. Then people can use the water not only toirrigate(灌溉) their fields but also top_______electricity for their homes and industries.

However, large cities and industries that are located on rivers often cause problems. As the cities grow in size and industries increase in number, the water in the rivers becomes polluted with c_______and other materials. People are learning the importance, however, of doing more to keep their rivers clean if they want to enjoy thebenefits(利益) of these natural resources.

【小题1】l___________
【小题2】t_____________
【小题3】B_____________
【小题4】a__________
【小题5】p____________
【小题6】c______________
18-19八年级下·上海·阶段练习
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Huge squares, great buildings and countless treasure — this year, the world’s largest   wooden palace, the Forbidden City, is 600 years old! It lived t【小题1】 fires and wars. But it still stands at the heart of Beijing today. And it never f【小题2】 to catch its visitors’ eyes.

Have you ever wondered who made this marvel(奇迹)?

In 1406, when the third Ming Emperor Yongle d【小题3】 to move the country’s capital from Nanjing to Beijing, he started to build a palace at the heart of Beijing. His vision(愿景) was big. It took a million workers 14 years to finish it.

People sent materials from all over China to Beijing. Nanmu, the rarest of all Chinese woods, was used to make huge wooden pillars(柱子). People can only find it deep in those warm forests over 1,800 km away from Beijing. Workers had to float(漂浮) the wood on rivers all the way n【小题4】 to Beijing.

Stones were also transported to the palace. The h【小题5】 stone in the Forbidden City is 250 tons. It was found 80 km west of Beijing. Because of its w【小题6】, people could only move it during winter. They poured water onto the road to create ice. Then t【小题7】of workers in front kept pulling the stone on the ice to the palace.

The project even changed the local landscape(地貌). While building a river around the palace, workers dug up soil and piled it on a hill behind the Forbidden City. That’s e【小题8】 where Jingshan came from.

The palace also holds many stories about ancient Chinese c【小题9】 that still stays with us today. For example, there are mythical(神话的) animals s【小题10】 on the palace’s roofs. The number of animals shows the status of a building — the more animals there are, the greater the building is.

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