18.The Leaning Tower of Pisa
The tower of Pisa has never been upright. Its leaning can date back to the time not long after it was built in 1173. First, the tower tilted towards the north. Then during the prolonged process of construction till 1370, the tower had always been leaning to the south.
Throughout the monuments history, many efforts have been made to halt the lean. These efforts have so far helped prevented the tower from topping over. But since 1911, the offset at the top of the tower has increased at a fairly consistent rate. Shortly after 1989, for the sake of safety, the tower at Pisa was closed to visitors.
In 1990, a special commission was organized to find new ways to save the tower. At first the commission worked mainly on the outside of the tower, but in the next few months, more radical techniques will be tried to stop the towers lean. The ultimate goal is not to straighten the tower but to ease its top back a little. With luck, the landmark can stand into the next century.
2016春外研版(一起)五下Module 5 Unit 1《Your bag is broken》ppt课件3
2016春外研版(一起)五下Module 1 Unit 2《He worked in an office》ppt课件5
2016春外研版(一起)五下Module 4 Unit 2《My favourite season is spring》ppt课件5
2016春外研版(一起)五下Module 4 Unit 2《My favourite season is spring》ppt课件7
2016春外研版(一起)五下Module 10 Unit 1《what did you put in your bag》ppt课件3
2016春外研版(一起)五下Module 5 Unit 1《Your bag is broken》ppt课件4
2016春外研版(一起)五下Module 3 Unit 2《You can use the computers》ppt课件1
2016春外研版(一起)五下Module 4 Unit 2《My favourite season is spring》ppt课件6
2016春外研版(一起)五下Module 1 Unit 2《He worked in an office》ppt课件7
2016春外研版(一起)六下Module 8 Unit 2《Why are you wearing a hat》ppt课件1
2016春外研版(一起)六下Module 9 Unit 2《Wishing you happiness every day》ppt课件1
2016春外研版(一起)五下Module 6 Unit 1《We’ll see lots of very big stones》ppt课件1
2016春外研版(一起)五下Module 10 Unit 1《what did you put in your bag》ppt课件1
2016春外研版(一起)五下Module 4 Unit 2《My favourite season is spring》ppt课件8
2016春外研版(一起)五下Module 5 Unit 1《Your bag is broken》ppt课件1
2016春外研版(一起)六下Module 9 Unit 2《Wishing you happiness every day》ppt课件3
2016春外研版(一起)六下Module 8 Unit 2《Why are you wearing a hat》ppt课件5
2016春外研版(一起)五下Module 3 Unit 1《Have you got the Harry Potter DVDs》ppt课件7
2016春外研版(一起)五下Module 4 Unit 2《My favourite season is spring》ppt课件2
2016春外研版(一起)五下Module 5 Unit 2《Mine is pink》ppt课件5
2016春外研版(一起)五下Module 5 Unit 2《Mine is pink》ppt课件4
2016春外研版(一起)五下Module 3 Unit 2《You can use the computers》ppt课件3
2016春外研版(一起)五下Module 1 Unit 2《He worked in an office》ppt课件6
2016春外研版(一起)五下Module 1 Unit 2《He worked in an office》ppt课件4
2016春外研版(一起)五下Module 4 Unit 1《Did you read them》ppt课件2
2016春外研版(一起)五下Module 3 Unit 1《Have you got the Harry Potter DVDs》ppt课件6
2016春外研版(一起)六下Module 9 Unit 2《Wishing you happiness every day》ppt课件4
2016春外研版(一起)六下Module 8 Unit 2《Why are you wearing a hat》ppt课件4
2016春外研版(一起)五下Module 10 Unit 1《what did you put in your bag》ppt课件4
2016春外研版(一起)五下Module 5 Unit 2《Mine is pink》ppt课件1
| 不限 |
| 英语教案 |
| 英语课件 |
| 英语试题 |
| 不限 |
| 不限 |
| 上册 |
| 下册 |
| 不限 |