单项选择题

56（）

A．in
B．by
C．as
D．of

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单项选择题
What is the purpose of the passage
A．To tell how "high tech" and "state of the art" have developed.
B．To give examples of "high tech".
C．To tell what "high tech" and "state of the art" are.
D．To describe very modem technology.
单项选择题
From this passage, we know that ______.
A．man never made sounds
B．man made animal sounds
C．man used to be like animals to make sounds
D．man learned from the animals to make sounds
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