单项选择题

Intelligent use of the muscles means that ______.

A．one always knows what his muscles are doing
B．one performs simple actions without working
C．one's muscles are used only to the extent necessary for each action they perform
D．one improves muscular action consciously

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单项选择题

According to this passage, the muscular sense is responsible for ______.

A．the efficiency of our muscle
B．the normal breathing function
C．the work of only our involuntary muscles
D．directing our muscles intelligently

单项选择题

An average woman is weaker than an average man because she has ______.

A．the muscular sense more important than any other sense
B．less muscle than men for her body mass
C．60 to 70 percent less muscle for her body mass
D．less muscle fiber for her body weight