单项选择题

A．Relaxing.
B．Watching TV.
C．Knitting sacks.
D．Collecting buttons.
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单项选择题
Korea attributes its improved economy to the use of knowledge and more investment and workers.
A．Y
B．N
C．NG
单项选择题
This passage mainly discusses how knowledge can affect human life.
A．Y
B．N
C．NG
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