The Compass　　The great sea voyages of Europes Age of Discovery, such as Christopher Columbuss trip to the West Indies in 1492, would have been impossible without the use of a compass. This great device for sea voyages was introduced to the West from China during the thirteenth century A.D. We have to thank ancient Chinese for their invention of the compass.　　The jade connection is important. Lodestone is a hard materialthough not as hard as some jade. And the making of a magnetic ladle, as well as a highly smooth stone board, would have required great skill. This suggests that the compass was invented by the jade finders of ancient China.　　31 What is the first paragraph mainly about?　　B The compass was invented by Columbus.　　D Columbus introduced the compass to the West Indies.　　A In 1492.　　C In A.D. 80.　　33 Which of the following about the ladle-shaped compass is true?　　B The handle of the ladle pointed north.　　D The bulk of the ladle remained unmoved on the board.　　A Because jade finders used the compass to detect lodestone.　　C Because jade finders were possibly the inventors of the compass.　　35 What would the paragraph following this passage most probably discuss?　　B Improvement on the ladle-shaped compass.　　D The sea voyages of Europes Age Of Discovery.