A. until B. ground C. as A. weren’t discovered【T7】______the 1930s B. A Swiss writer wrote that the Nazca lines were desi

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问题 A. until     B. ground     C. as
A. weren’t discovered【T7】______the 1930s
B. A Swiss writer wrote that the Nazca lines were designed【T8】______a landing place for UFOs.
C. Seen from the【T9】______, it looks like lines scratched into the earth.
    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.【T10】______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【T11】______, 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.【T12】______However, it would probably be very tricky to find a spaceship in the middle of pictures of dogs and monkeys.
【T12】

选项 A、 
B、 
C、 

答案B

解析 空格前讲到研究者得知这些线条已有1 500年的历史,但其存在的目的还不得而知。空格处应该进一步说明这种情况。因此,B选项(一个瑞士作家写到Nasca lines被设计成一个UFO的着陆场所)正是对目的的一种猜测。空格后的转折词(however)表示对这种猜测的否定。因此B为最佳选项。
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