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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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热门试题

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.

单项选择题A．They will find out what its people like.B．They will know how to live in another way.C．They will know the country and its people better.D．They will like its inhabitants and their language.

A．They will find out what its people like.
B．They will know how to live in another way.
C．They will know the country and its people better.
D．They will like its inhabitants and their language.