单项选择题

A．Better.
B．Not too well yet.
C．Much better.
D．Even worse.
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D
单项选择题
A．The invention of machines.B．The invention of the alphabet.C．The invention of rockets.D．The invention of agriculture.
A．The invention of machines.
B．The invention of the alphabet.
C．The invention of rockets.
D．The invention of agriculture.
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