单项选择题

A、6
B、-6
C、4
D、8

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单项选择题

When was silk introduced to the Roman Empire?
A、The 4th and 3rd centuries BC.

B、At some point during the 1st century BC.

C、At some point around the year 3,000 BC.

D、At some point around the year 2,700 BC.