问题描述：
2.—— map dates back to about 3,000 B.C.求讲解
2.—— map dates back to about 3,000 B.C.
（A） Known to be the oldest
（B） It was the oldest known
（C） Known as the oldest
（D） The oldest known
2.—— map dates back to about 3,000 B.C.
（A） Known to be the oldest
（B） It was the oldest known
（C） Known as the oldest
（D） The oldest known
问题解答：
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