单项选择题

A．Because it was one of the first tools.
B．Because it developed human capacities.
C．Because it led to the invention ol machines.
D．Because it was crucial to the development of mankind.
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单项选择题
A．More muscles than average people.B．A strong will.C．Strength, fitness and endurance.D．A strong heart.
A．More muscles than average people.
B．A strong will.
C．Strength, fitness and endurance.
D．A strong heart.
填空题
What does it mean by he had to eat his words (Line 2,Para. 1)
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