填空题

What are the two mysteries that have remained unknown to the modern people

【参考答案】

When man began to use fire and language．
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单项选择题
A．The people of the Northeast.B．The significance of the Northeast.C．The development of the United States.D．The location of the nation’s capital.
A．The people of the Northeast.
B．The significance of the Northeast.
C．The development of the United States.
D．The location of the nation’s capital.
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