What did the workers do when they found the third floor leaned northwards？

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A. They thought it would not cause trouble and continued their work.

B. They made the structure of the third story towards the north taller.

C. They demolished the tower and rebuilt it from the beginning.

D. They asked help from experts and successfully stopped the leaning.

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第1题

Questions are based on the following passage．The tower of Pisa has been leaning so long——n

Questions are based on the following passage．

The tower of Pisa has been leaning so long——nearly 840 years——that it"s natural toassume it will go against gravity forever. But the famous structure has been in danger ofcollapsing almost since its first brick was laid.

It began leaning shortly after construction began in 1173. Builders had only reachedthe third of the tower"s planned eight stories when its foundation began to settle unevenlyon soft soil composed of mud， sand and clay. As a result， the structure leaned slightly tothe north. Laborers tried to compensate by making the columns and arches of the thirdstory on the sinking northern side slightly taller. They then proceeded to the fourth story，only to find themselves out of work when political unrest halted construction.

The tower sat unfinished for nearly 100 years， but it wasn"t done moving. By thetime work restarted in 1272， the tower tilted to the south——the direction it still leans today.

Engineers tried to make another adjustment， this time in the fifth story， only to have theirwork interrupted once again in 1278 with just seven stories completed.

Unfortunately， the building continued to settle， sometimes at an alarming rate.Finally， between 1360 and 1370， workers finished the project， once again trying to correctthe lean by angling the eighth story， with its bell room， northward.

In 1989， a similarly constructed bell tower in Pavia， northern Italy， collapsedsuddenly. Officials became so worried the tower of Pisa would suffer a fate similar to thecollapsed tower in Pavia that they closed the monument to the public. A year later， theyrallied together an international team to see if the tower could be brought back from thebrink.

By 2001， the team had decreased the tower"s lean by 44 centimeters （17 inches），enough to make officials confident that they could reopen the monument to the public. Theactions taken by Burland and his team could， theoretically， stabilize the structure forever.

The real threat now comes from the masonry （石造建筑） itself， especially the materialin the lower stories， where most of the forces caused by the centuries-long leaning havebeen directed. If any of this masonry crushed， the tower could collapse. And even a minorearthquake in the region could have devastating consequences.

In spite of these potential problems， engineers expect the famous structure willremain stable for at least another 200 years. By then， another intervention may berequired， but the technology available to make improvements could be far more advancedand preserve the tower for another 800 years.

Why did the tower of Pisa begin to lean since its first brick was laid? 查看材料

A.The workers didn"t do exactly what they were ordered.

B.People at that time appreciated something special.

C.It was build on soft soil composed of mud， sand and clay.

D.The workers made a big mistake during construction.

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第2题

Ezekiel Emanuel and Victor Fuchs pointed out that medical students should beassessed on th

eir ability instead of how much time they have served.

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第3题