单项选择题

According to the selection, the muscular sense is responsible for （）

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

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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

单项选择题

Muscles are unique fibers, because they can （）

A．contract
B．stretch
C．retract
D．do all of the above