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A very old school is in Shanghai, China. The school is 85 years old. Engineers wanted to move it to another place. Builders wanted to build a business building in the same place.

Engineers put more than 200 robotic legs(机械腿）under the school. The legs moved up and down. They turned around. The building lifted off the ground. It looked like the school was walking.

The school walked 62 meters. The school was very heavy. It weighed 7,600 tons. It took 18 days to move the school. Engineers were happy. It was the biggest work for them to finish. And they did it well.

1.Engineers moved the old school _______.

A to build a road

B to build a hospital

C to build a new one

D to build a business building

解析：选D。细节理解题。根据文章第一段最后一句Builders wanted to build a business building in the same place.可知，建筑商希望在同一个地方建造一座商业大楼，故选D。

2.What can we learn about robotic legs ?

A They can move quickly.

B They can make the school move.

C They are parts of the school.

D There are about 200 robotic legs.

解析：选B。推理判断题。根据文章第二段最后一句It looked like the school was walking. 可知，看起来学校在走路，由此推断机械腿能使学校移动，故选B。

3.The last paragraph doesn’t tell us _______.

A how far the school walked

B how heavy the school was

C how much the moving cost

D how long it took the school to move

解析：选C。细节理解题。根据文章第三段内容可知，学校步行了62米，学校重达7600吨，搬迁花费了18天。文中未提及学校的搬迁费用，故选C。

4.Why did engineers feel happy?

A Because they saved a lot of money.

B Because they kept the old school safe.

C Because they finished the biggest task well.

D Because they moved a school for the first time.

解析：选C。细节理解题。根据文章最后一段It was the biggest work for them to finish. And they did it well.可知，这是工程师们完成的最大工作，而且他们做得很好，故选C。