填空题

How many inventions and discoveries made by man are mentioned in the passage

【参考答案】

Six
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填空题
In the author’s eyes, ______ development is the most significant one in the human history.
单项选择题
A．That he wants something to eat.B．That he will tell them.C．That he is not hungry.D．That he is angry.
A．That he wants something to eat.
B．That he will tell them.
C．That he is not hungry.
D．That he is angry.
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