单项选择题

A．One to three million years ago.
B．Two to three million years ago.
C．One to three billion years ago.
D．Two to three billion years ago.
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单项选择题
A．It cost too much time.B．The walls were too hard to engrave.C．The drawings were too simple to recognize.D．It wasn’t portable.
A．It cost too much time.
B．The walls were too hard to engrave.
C．The drawings were too simple to recognize.
D．It wasn’t portable.
单项选择题
A．Its merchant fleet ruled the Mediterranean.B．The secrets of Syria’s glassmaking were known by Venice’s craftsmen.C．Venice’s glassmaking industry was artistically influenced by Islam.D．It had more than 8,000 craftsmen at one point.
A．Its merchant fleet ruled the Mediterranean.
B．The secrets of Syria’s glassmaking were known by Venice’s craftsmen.
C．Venice’s glassmaking industry was artistically influenced by Islam.
D．It had more than 8,000 craftsmen at one point.
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