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题目内容
（西安科技大学-大学英语）
【单选题】
____is the solid evidence of the advanced civilization on the earth.
A、
Electricity
B、
The steam engine
C、
The virtual world
D、
New kinds of transportation
____is the solid evidence of the advanced civilization on the earth.
A、
Electricity
B、
The steam engine
C、
The virtual world
D、
New kinds of transportation
参考答案
