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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热门试题

单项选择题

According to this passage, more than haft of a person's body is composed of ______.

A．involuntary muscles
B．muscle fibers
C．voluntary muscles
D．sensory nerves

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