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  3. The Mysteryies of Nazca In the desert of Peru，300 kilometers from Lima，one ...

The Mysteryies of Nazca In the desert of Peru，300 kilometers from Lima，one ...

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问题 The Mysteryies of Nazca
In the desert of Peru，300 kilometers from Lima，one of the most unusual artworks in the world 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 9oo 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 were 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 Investigated 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 any thing this big.
Recently，two other scientists, David Johnson and Steve Mabee，have specuiated that the lines could have been related to water. Nazca is one of the driest places in the world and receives only 2 cm of rain every year. While Johnson was searching for ancient water sources in the area，he noticed that some waterways built by 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)
选项
答案D
解析这一段说的又是一种猜测，即这利建设有关，不过这也只是个别研究者如Johnson的猜测，尚需更多的证最后一句话“Other scientists are now searching for evidence to prove this. ” 正是是这一点。此外，这个句子中的代词 this 也在上文里找到合适的所指，即Johnson的猜测。
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