In the desert of Peru, 300 kilometers from Lima, one of the most unusual artworks in the world国has mystified (迷惑)people for decades. __________ (46) But from high above, these marks are huge images of birds, fish, seashells, all beautifully carved into the earth.
　　The Nazca lines are so difficult to see from the ground that they weren't discovered until the 1930s, when pilots spotted them while flying over the area. In all, there are about 70 different human and animal figures on the plain, along with 900 triangles, circles, and lines.
　　Researchers have figured out that the lines are at least 1, 500 years old, but their purpose is still a mystery. __________ (47) However, it would probably be very tricky to land a spaceship in the middle of pictures of dogs and monkeys.
　　In the 1940s, an American explorer named Paul Kosok suggested that the drawings are a chronicle (记录) of the movement of the stars and planets. __________ (48) Later, an astronomer tested his theory with a computer, but he couldn't find any relation between the lines and movements in space.
　　Another explanation is that the lines may have been made for religious reasons. British researcher
　　Tony Morrison investigaled the customs of people in the Andes Mountain and learned that they sometimes pray by the side of the road. It's possible that in the past, the lines of Nazca were created for a similar purpose. __________ (49) But the local people have never constructed anything this big.
　　Recently, two other scientists, David Johnson and Steve Mabee, have speculated that lines could have been related to water. Nazca is one of the driest places in the world and receives only 2cm of rain every year. While Johnson was searching for ancient water sources in the area, he noticed that some waterways built ancient people were connected with the lines. Johnson believes that the Nazca lines are a giant map of the underground water in the area.__________(50)
　　A. Other scientists are now searching for evidence to prove this.
　　B. A Swiss writer named Erich Von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.
　　C. Scholars differ in interpreting the purpose of the designs.
　　D. The largest pictures may have been the sites for special ceremonies.
　　E. Seen from the ground, it looks like lines scratched into the earth.
　　F. He called Nazca "the largest astronomy book in the world".
第6部分：完形填空(第52～65题，每题1分，共15分)
　　下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。
The Old Gate

　　In the Middle Ages the vast majority of European cities had walls around them. This was partly or __________ (51) reasons hut another factor was the need to keep out anyone regarded as undesirable,like people with contagious(52) __________. The Old City of London gates were all (53) __________ by the end of the 18th century. The last of London's gates was removed a century ago, (54) __________by a stoke of luck, it was never destroyed.
　　This gate is, in (55) __________fact, not called a gate at all; its name is Temple Bar, and it marked the(56) __________between the Old City of London and Westminster. In 1878 the Council of London took the Bar (57) __________, numbered the stones and put the gate in storage (58)__________its design was unfashionable, and it was expensive to (59) __________ and it was blocking the traffic.
　　The Temple Bar Trust was set up in the 1970s with the __________ (60) of returning the gate home, The aim of the trust is the __________ (61) of the nation's architectural heritage.
　　Transporting the gate will __________ (62) physically pulling it down, stone by stone, removing and rebuilding it near St. Paul's Cathedral. Most of the facade of the gate will probably be (63) __________,though there is a good___________ (64) that the basic structure will be sound. The hardest (65)__________of all, however, will be to recreate the statues of the monarchs that once stood on top of the gate.
　　51.
　　A. sensitive
　　B. defensive
　　C. offensive
　　D. primitive
　　52.
　　A. disease