题目内容：
What can we learn about the Mayan calendar?A. It was based on the European calendars.
B. It was better than European calendars.
C. It was as accurate as European calendars.
D. It was copied by European calendars.
参考答案：
答案解析：
单选题：What can we learn about the Mayan calendar?A. It was based o
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A. It was based on the European calendars.
B. It was better than European calendars.
C. It was as accurate as European calendars.
D. It was copied by European calendars.