(单选题)

What was the theory that the earth was round based on?

A.You would eventually come to the edge of the world.

B.You would eventually come to the edge of the ocean.

C.You would eventually come back to where you started.

D.You would eventually come back to where you ended.

参考答案：C

参考解析：

细节理解题。根据第一段第四句“This meant that by traveling far enough in a straight line, you would eventually come back to where you started.”可知，地球是圆的这一理论主要是基于，当你直线旅行足够远，你就能够到达你出发的地方。A项，B项和D项在文中未提及。故选C。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语