题目内容：
请在（50）处填写正确答案。
A．He called Nazca “the largest astronomy book in the world” B．Seen from the ground, it looks like lines scratched into the earth.
C．Scholars differ in interpreting the purpose of the designs.
D．Other scientists are now searching for evidence to prove this.
E．A Swiss writer named Erich von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.
F．The largest picture may have been the sites for special ceremonies.
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