单项选择题

For over a million years, our forefathers were basically ______.

A．successful farmers
B．co-operating hunters
C．runners and jumpers
D．skillful sportsmen
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单项选择题
The author believes that sporting activities ______.
A．are forms of biological development
B．have actually developed from hunting
C．are essentially forms of taming the prey .
D．have changed the ways of hunting
单项选择题
Which of the following is TRUE
A．Man is more colour-conscious than the honey-bee.
B．The honey-bee is blind to red.
C．The honey-bee can see far more colours than man.
D．Man is sensitive to the ultra-violet.
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