单项选择题

The wheel was probably invented by （）

A．a group of early hunters
B．the first men on earth
C．a great prehistoric thinker
D．the man who made the first cart

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单项选择题
The wheel is called （）

A．simple
B．complicated
C．strange
D．unusual
单项选择题
What is the author's attitude towards the U. S. Bureau of Labor Statistics（）

A．Critical
B．Supportive
C．Negative
D．Encouraging
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